It doesn't depend on how the us dollar is treated or how the economy is going, it depends on how powerful USA is in the world politics and that is the most important part. Sure when you look at the military side, they are spending more than the next 26 nations combined, 27 if they increase it once again this year, so when you talk about military power they will always and forever will be the biggest power in the whole world, they literally send dozens of PLANE CARRIER SHIPS AS BIG AS SOME ISLANDS, that is bonkers.

However politics is not only military, you have to do some bit of good dialogue, good with your allies, better with your enemies as well, try to work things out and stay at the top. If they can keep their position like this, the power of dollar will never cease.