Age of Optionality: The Future is Not About Replacing the US Dollar

Debate about the future of the international financial system has long been framed by a deceptively simple question: is the US dollar losing its dominance?

The growing use of renminbi in bilateral trade agreements, BRICS communiqués calling for greater use of local currencies, and the development of new payment platforms as well as central bank digital currencies (CBDC) are routinely interpreted as steps towards a post-dollar world. The anticipated future by many commentators has become almost binary: either the dollar retains its supremacy or another currency, most probably the Chinese renminbi, will replace it.

That framing obscures the more consequential change now taking place. As discussed at a recent Singapore roundtable organised by RUSI’s Centre for Finance and Security, the defining feature of this emerging financial landscape is not the search for a successor to the US dollar. Rather, it is the steady expansion of optionality – the ability of states, financial institutions and businesses to pick and choose between multiple financial infrastructures depending on political, commercial or strategic circumstances. Viewed from this perspective, the future of financial power is not simply a binary question.

There is little reason to expect the US to lose its central position in global finance any time soon. The dollar remains the world’s principal reserve currency, dominates foreign exchange markets, underpins international trade and provides the foundation for much of the rapidly expanding stablecoin ecosystem. These advantages are reinforced by deep and liquid capital markets, comparatively robust legal institutions and network effects accumulated over decades.

What has changed is that dominance no longer guarantees exclusivity. Increasingly, governments are hedging and investing in alternative payment systems, regional settlement arrangements, domestic card networks, local currency trading mechanisms and digital financial infrastructure. They are not necessarily seeking to abandon the existing international financial system. Rather, they are seeking to ensure they are no longer beholden to it.

The US dollar can therefore remain dominant as a currency even as the infrastructure through which value is transferred, settled and regulated becomes more plural. This distinction between replacement and optionality has meaningful implications for economic statecraft.

A World Seeking Insurance

The post-Cold War period was characterised by an unprecedented concentration of financial power. The combination of dollar dominance, the central role of correspondent banking, the ubiquity of SWIFT messaging for communicating between banks, and the extraterritorial reach of Western financial regulation created an international system that was extraordinarily efficient but also highly centralised.

This centralisation became one of the West’s greatest strategic advantages and spurred the development of financial sanctions as one of the principal instruments of foreign policy. Measures imposed against Iran demonstrated the effectiveness of combining sanctions with restrictions on access to the international financial system. Following Russia’s full-scale invasion of Ukraine, the unprecedented coordination of sanctions by the US, European Union and partners further reinforced the perception that access to Western financial infrastructure had become inseparable from geopolitical influence.

For many governments these developments have not catalysed attempts to challenge American financial leadership directly. Instead, they have prompted more practical consideration of what happens if access to key elements of the existing financial system is disrupted.

Until recently, most countries have had few credible alternatives to remaining closely tied to the US dollar-based financial system. Now, building alternatives is becoming more technically and commercially feasible. Importantly, in most cases, these alternatives are not designed to replace existing infrastructure overnight. They are intended to provide resilience if access to traditional, US dominated channels, becomes constrained.

Countries are therefore seeking insurance rather than revolution. For example, countries continue to use SWIFT while investing in alternative messaging platforms, and they continue to invoice trade in US dollars while experimenting with different settlement currencies and mechanisms. Rather than replacing one system with another, they are constructing diversified portfolios of financial relationships that reduce dependence upon any single point of failure.

This optionality will not be distributed evenly. Major economies with large markets, sophisticated financial sectors and extensive trading relationships may be able to construct genuine operational alternatives. Smaller states will possess fewer choices and risk exchanging dependence on Western infrastructure for dependence on another external provider. The expansion of operationality does not therefore mean the disappearance of financial hierarchy. However, it does mean that the sources and distribution of financial dependency are becoming more complex.

Historically, the international financial system functioned as a relatively integrated ecosystem. But today, individual components can increasingly be substituted without requiring wholesale abandonment of the broader system. A country might use the US dollar as a unit of account while settling transactions through a non-Western platform; or retain access to Western financial markets while developing domestic payment platforms. The consequence is a financial architecture that is becoming more layered and flexible, rather than simply dividing into rival blocs.

China’s Ambitions May be Misunderstood

Discussion of financial competition frequently assumes China seeks to replicate the role that the US has played since the Second World War.

Beijing has undoubtedly invested heavily in renminbi internationalisation, developed the Cross-Border Interbank Payment System, expanded bilateral currency swap arrangements and promoted digital financial innovation. These initiatives are often interpreted as evidence of a deliberate strategy to replace US dollar dominance, but replacement may never have been the primary objective, for very practical reasons.

Becoming the issuer of the world’s principal reserve currency requires accepting significant trade-offs, including open capital markets, deep financial liberalisation and a willingness to supply global liquidity during periods of crisis. These characteristics have historically underpinned US dollar dominance but sit uneasily alongside features of China’s present economic and political model, including capital controls and the state’s close management of its financial system.

A more plausible interpretation is that China seeks something different: strategic resilience. Rather than replacing the US dollar entirely, Beijing appears focused on ensuring that Chinese firms, financial institutions and trading partners possess credible alternatives should access to Western financial infrastructure become restricted.

Success for China may therefore be less a matter of achieving reserve currency dominance, and more about providing an alternative financial infrastructure to those countries with which it trades. If Chinese infrastructure becomes sufficiently useful that governments and businesses choose to maintain access alongside existing Western systems, then China’s strategic position has strengthened regardless of whether the renminbi overtakes the dollar in international payments or central bank reserves.

Technology is Lowering the Cost of Choice

Alongside the growing maturity of financial markets outside the West, digital innovation is accelerating this trend by lowering the cost of constructing alternative mechanisms. The debate surrounding CBDCs and stablecoins is frequently presented as a competition between rival technologies and monetary models. In reality, both contribute to expanding the number of available financial pathways through which value is transferred and settled.

Stablecoins illustrate the complexity of this shift. Far from undermining US dollar dominance, most stablecoins reinforce it through their reliance on dollar-denominated collateral. They can make dollar-dominated value more accessible and transferrable across borders, including in jurisdictions where access to conventional dollar banking is limited. At the same time, stablecoins operate outside formal banking channels, thereby reducing transparency for regulators accustomed to monitoring correspondent banking networks. As a result, while the US dollar may become even more widely used, some traditional instruments of financial oversight become less effective as a result.

CBDCs raise a different set of possibilities regarding new forms of cross-border settlement. A network of interoperable digital currencies could allow transactions to bypass established correspondent banking relationships without requiring countries to abandon the dollar across all dimensions of trade and finance. Technology is therefore not replacing the existing monetary hierarchy but making it more modular. Currency choice, payment infrastructure, settlement arrangements and regulatory oversight can increasingly be separated from one another.

Optionality Changes Economic Statecraft

These developments carry important implications for the tools of economic statecraft. Financial sanctions derive much of their effectiveness from the centralisation of existing financial infrastructure. They raise the cost of international commerce by limiting access to payment systems, correspondent banking and global capital markets.

Alternative payment mechanisms often remain slower, less liquid and more expensive than established Western infrastructure. Consequently, countries and businesses will continue to prefer existing systems under normal circumstances. However, when confronted with sanctions or geopolitical pressure, those alternatives become more attractive despite their imperfections. An inefficient alternative can still be strategically valuable if it permits transactions that would otherwise be impossible.

Thus, the value of alternatives does not lie in outperforming the incumbent system under ordinary conditions. It lies in providing credible alternatives during periods of disruption. Western policymakers therefore face a more complex challenge than preserving financial dominance – they must preserve preference.

Competing to Remain Indispensable

This distinction should shape future policy. Attempts to prevent the emergence of every alternative payment system are unlikely to succeed and may prove counterproductive by encouraging further investment in competing infrastructure. Instead, policymakers should focus on maintaining the qualities that have historically made Western financial markets attractive: openness, legal certainty, liquidity, innovation, transparency and institutional trust.

At the same time, maintaining the status quo will not suffice. Investing in the next generation of financial infrastructure is necessary to ensure the Western financial system remains attractive to global users. Digital identity, programmable payments, tokenised assets, interoperable settlement systems and effective regulation of digital finance will all influence whether existing financial centres remain at the forefront of international finance. Leadership will increasingly depend upon innovation as much as incumbency.

Western governments should also devote greater attention to understanding how emerging payment ecosystems interact with each other. The future is unlikely to consist of competing financial blocs separated by rigid boundaries. It is more likely to resemble a network of overlapping systems connected through intermediaries, technical gateways and multiple forms of interoperability.

This overlap will create both resilience and vulnerability. Interoperability can make financial systems more efficient and reduce concentration risk, but it will also create new channels through which sanctions and illicit activity modes between regulated and less-regulated environments. Understanding where systems connect – and who controls those points of connection – will become as important as understanding the systems themselves.

This requires new analytical frameworks. For too long, policymakers have measured financial influence primarily through reserve currency shares or the size of capital markets. These metrics remain important but are increasingly insufficient.

The ability to move between systems, to choose different payment rails, settlement mechanisms, currencies or digital assets depending upon circumstance, may become just as strategically significant as the absolute dominance of any single infrastructure.

The Age of Optionality

The international financial system is not entering a post-dollar era, nor is it returning to a fragmented world of competing monetary blocs. Instead, it is evolving towards a layered ecosystem in which multiple infrastructures coexist, overlap and compete. States and firms will increasingly be able to diversify financial relationships without abandoning established ones.

For the US and its allies, that should not be interpreted as evidence of inevitable decline. The US dollar is likely to remain central to global finance for the foreseeable future, and no alternative currently offers the same combination of scale, trust and liquidity that underpins its position.

But dominance no longer equates to monopoly. A growing number of alternatives exist, even where they remain less efficient or attractive than the incumbent system. Their significance lies not in replacing the US dollar, but in providing choice when access to the existing system becomes uncertain or politically costly.

In sum, financial power in the twenty-first century will depend less on controlling the only system than on remaining the most attractive system within a world of expanding choice.

© RUSI, 2026.

The views expressed in this Commentary are the authors', and do not represent those of RUSI or any other institution.

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