The ubiquity of US dollars in international trade allows US to torpedo the economy of any country it so desires. It is like the US has a kill switch to shut down any economy it wishes to. But the only reason the rest of the world plays along and allows the kill switch to exist is that they trust the US to use it responsibly and only in extreme circumstances. Now with the erosion of that trust, it is to be expected for the world to move towards eliminating that threat.