As long as the dollar remains the reserve currency of the world and US retains its hegemony, a lot of the finances will work itself out, the only threat to the US empire crumbling is by losing a major war or extreme civil unrest and that threat is astronomically low. The US is orders of magnitude stronger than the Roman Empire, I don't think people realize the scale or control.
> The US is orders of magnitude stronger than the Roman Empire
This would be trivially true even if the US was currently in its death throes (which there is plenty of evidence that the US-as-empire might be, even if the US-as-polity is not), as the Roman Empire fell quite a while ago.
Gradually, then suddenly. Best not to underestimate the extent to which the USA has lost trust in the rest of the world, and how actively people and organisations are working to derisk by disengaging. Of course that will neither be easy nor particularly fast, but I'm not certain it can be stopped at this point.
Famous last words of empires. I doubt that if current situations continue that the US will in any sense be still thought of as the reserve currency.