I would suspect it will end in succession of various states and possibly followed by civil war. But what the hell would then happen about possible international conflict directed at us from abroad? It looks ugly to me.
The only salvation that I can see for the United States is a Switzerland type government of cantons. Each canton pretty much runs its own business and the Central Government takes care of international relations and defense. In this manner the Swiss have been able to blend German, Italian and French culture into a very functional nation. What I am really saying is state rights must be returned to the States and the Federal Government must be minimal.
You are talking about an authentic federalism. The Civil War effectively killed that. I agree that it is the only way forward without mass slaughter or dissolution.
I hope I don’t see any that in my lifetime and I hope my children won’t see it either.