I know a lot of people (including natives) who are leaving California right now because of: "high taxes, politics, bad behavior in general as well as housing prices and the fact that cities like LA and SF are turning into open shelters for homeless on the streets". These are all the reasons why people are fleeing California from what I've heard so far. People are moving to Oregon, Washington, Texas, Arizona, etc.
This includes mostly upper middle class (colleagues, friends, etc. from my entourage). How could we avoid losing skilled workers in California? How could we make California super attractive again?
* Take zoning away from local zoning boards or at least place limits on the power of NIMBYs at the state level.
* Reform zoning laws to encourage infill and mixed use development. If local zoning boards won't do this override them at the state level.
* Impose a stiff tax on foreign non-occupant real estate purchases. Houses are for people, not to act as a proxy financial instrument for non-residents to exfiltrate capital and launder money. (I have no opposition to immigrants purchasing homes to live in. I'm talking about non-occupant cash buyers using our real estate as a financial instrument.)
* Repeal proposition 13. It would require a phase-out over a long period of time, but would add tax increases as a counter-pressure against real estate price hyperinflation. As it stands there is no downside for homeowners to do everything in their power to inflate housing.
* Invest a lot more in public transportation to make more of the housing stock reachable and commutable for more people. Some of the money for this could come from taxing foreign non-occupant purchases of RE, etc.