More likely the Federal Reserve will end the Dollar's reign,by mass printing more dollars.
Anyway,the US dollar might not be a world's reserve currency after 10-20 years,but it will remain the national currency of USA,as long as USA continues to exist in the next centuries.
USA still has the strongest economy in the world,which means that the US dollar will still be very strong,even though it won't be a reserve currency for many central banks around the world..