Do you remember the situation that precipitated the Nazi takeover of Germany? Wasn't it hyperinflation and economic collapse? And you think it would be a good idea to push the US further in that direction?
You'll get worse, not better.
> A new civil war that drives the US to fragment into several independent regions over the course of the next ~five years would kind of be the best scenario from a global perspective.
Are you serious? That's an utterly insane idea. The best scenario from a global perspective is the US regains its stability. Europe is in no position to defend itself militarily, it relies on US support via NATO. I believe similar is true of Japan and other countries. A US civil war would only help Russia and China (Russia would gobble up Ukraine and who knows what else, China would take Taiwan and dominate/subjugate the rest of Asia, like Japan, in some fashion that non-Chinese nations wouldn't be happy with).
Also US polarization isn't regional (e.g. a big part is urban/rural). There's no "fragmentation into independent regions" that would really solve the problem.