The more separate each state is from such an overpowered executive branch, the better. Under more normal circumstances I'm very anti "states rights", but there's too much unchecked power in one place now.
Notice how the GOP stopped removed about states rights the moment they won everything? It was never about states rights. It was about hoarding power and unchecked authoritarianism.
Secession is still a minority movement all things considered. Yes California went nowhere. It would be an action in the leadup of a complete collapse, so constitutional crisis or not, there may not be a US Government to effectively enforce it.
Chief Justice Chase said at the time of White v Texas that a revolution by a state couldn't be stopped by White v Texas. Scalia's remarks on this (Paywall) never addressed revolution, only that a state can't secede by law.