BRICS nations like China are desperately trying to move off the dollar, which is a major tool of US control. The problem is, nobody trust the Yuan, the Ruble, or any of their other fiat currencies. They can't trust each other, so the US remains the global currency hegemon. But that is a privileged position it basically only got because everybody else was blown up after the world wars. The US's position in this area will continue to erode.
There is a fantastic overview of how the US uses the dollar to control other countries and extract trillions of dollars from them while keeping them in a cycle of debt. The Human Rights Foundation https://youtu.be/7qRWurFaUD0?list=PLe0djdakvnFb0T-oZAeF49A-EZChise4n&t=14009 and another one on how France abuses its currency influence in Africa to keep the colonial legacy alive https://www.youtube.com/watch?v=_-u1Pjce4Lg&pp=ygUxaG93IGZyYW5jZSBjb250cm9scyBlbnRpcmUgZWNvbm9taWVzIGZyYW5jb2RvbGxhcg%3D%3D
What will replace it? My bet is on Bitcoin. A few smaller nations (Ecuador, Argentina, El Salvador) have embraced it as a way to reduce the control the US has over their economies. AThe blowback from the world bank etc has been very telling. They do not like the idea of a country that doesn’t want to get stuck in a cycle of debt, restructuring, and subservience to the dollar.
But it doesn't change that Bitcoin is a politically neutral currency that cannot be controlled by any nation state or even group of nation-states. It is immune to corruption and human error or greed. It just works well to send money from A to B and nobody can cheat it. It's market cap is 850 billion dollars, that puts it in the top 25 countries by GDP. On par with Switzerland. Higher than sweden. Higher than Israel. Higher than vietnam.
Anybody can use Bitcoin with a cell phone and a halfway reliable internet connection. With Bitcoin lightning, you can send an international transaction in under a second for pennies in fees. No credit check required, no middlemen, no nonsense. It doesn't matter if your country doesn't have stable banking infrastructure or a government constantly devaluing your currency. And it does all of this with less than 1% of global energy usage, mostly from renewables, since miners tend to chase the cheapest electricity which tends to be made from renewables at off-peak hours.