The US wields incredible negotiating power and hegemony because the dollar is the world’s reserve currency. Like the British pound and the Dutch guilder before it, if that loses reserve currency status it will be harder to borrow on favorable terms, which would affect the entire US economy. This is a big step in that perhaps starting to happen over the next few decades.
Losing the reserve currency doesn't happen in a vacuum. It happened to the British and Dutch because their empires were dismantled. So, yeah, it could happen to the US, slowly, over time (it already is). But nobody wakes up tomorrow and says they no longer want USD. Where are you parking the money, yuan?
Depends what happens tomorrow