What will replace the U.S. dollar?

I'm curious, what do you envision as the potential successor to the U.S. dollar as the world's dominant currency? Could it be a digital currency like Bitcoin, or perhaps a new global reserve currency backed by a basket of currencies and commodities? What factors would need to be in place for such a shift to occur, and how might it impact global economies and financial systems? Is there a possibility that the U.S. dollar could maintain its status as the world's primary reserve currency indefinitely, or are there inevitable changes on the horizon?