a vital part of global economics

... because they violently overthrow any government that tries to dedollarize. This is the only reason US is still part of global economics.

nuking it from orbit is a bad thing for others as well

Will there be an economic downturn? Sure, for a bit, while countries adjust. But there will also be much less war and genocide, which is worth it on its own, and by now the US doesn't have any real industrial sector apart from weapons manufacturing so supply chains won't be affected much (with very few exceptions, like airplanes).

Of course a revolution in the US would be better, but I don't see that happening for a while. TBH neither do I see america truly being destroyed by Trump, he seems to have something worse in mind as I've said.