But what to move to?
It is a mistake to think that the world needs a reserve currency.
Trade will happen using whatever currency both parties agree to use. It can be one of their currencies or a third party currency.
It doesn't matter.
After forcing other nations to comply with our foreign policy by using the dollar, no nation will enslave themselves to another reserve currency.
But once the dollar is rarely used by other nations for trade, its value will drop and our economy will collapse.
Like zero interest rates from the Fed, the dollar as reserve currency artificially props up our economy.