I can see a scenario where Trump is impeached on phony evidence and convicted and removed from office. I can see about 30 states passing ordinances not recognizing the outcome of said impeachment and recognizing Trump as President. I can see Trump flying to one of those states and setting up a a new federal govt there. I can see those states then seceding. Yes I can see that happening.
Your scenario the states just melt away like they don't exist.