They won't. That would take some degree of effort. Besides, they wouldn't get all the free sh*t they get here. Far easier to grip, bitch, whine, loot, burn, riot, and gang up on elderly or very young people.
Thing about pendulums, though, is that they WILL swing. and after they've swung one direction and reached their apex, they WILL swing back the other way. God help them when that happens. In fact, it's beginning to happen now.
1. The people there who don't want to stay have a week to get out.
2. Anyone wanting to live in this new utopia who lives in the other 49 states get free one-way passage.
3. A wall/fence will be built on the California border.
4. The wall/fence along the California/Mexico border will be removed.
5. Whatever is there, you can keep. But you ain't getting any money from the US to keep yourselves going.
6. You no longer get any say-so in what happens in the other 49 states; think legal status of DC.
6. If you decide to stay in the other 49 states and you start this crap again, you'll be removed to California.