California is just about the only state that could survive in a non-union economic perspective as we rank among the top 10 world economies. (We also grow a great deal of the nation's food... however would suffer as out water comes largely from elsewhere in the Union... just an example of why this wouldn't work out so well... for anybody.) That said, it would still be illegal for any state to attempt secession, barring activist judiciary action like we see again today from the far-right conservative court possibly overturning the precedent that would bar states from seceding in the first place..
The biggest fault of politics today is that we have allowed a rulership class to exist. The founders never intended for this. It was expected that people would serve for a term or two, then return to their private lives. Like many aspects of the modern world, there are simply things that the founders did not envision. Sadly, those are the loopholes that are being taken advantage of in many instances. Term limits for government officials is a primary example, and one that should honestly extend to the judiciary as well.