Just my little data point but I moved into a sleepy little ID town that has a lot of people that have moved here from SoCal, and of the 5 people I asked "what brought all the way up to Idaho from California?" 4 of them commented on how expensive California was and the high cost of living. 3 of them also stated that they didn't like how things were happening in Cali.
Again small anecdotal data point but take it for what it is worth.
Well, it would make sense that the people who left California feel unhappy with California; Not that it's what you were saying, but just because it's likely that those who left the state are unahppy with it, that does not mean most people in California are unhappy with it.
In fact, I love California so much that I buckled the popular media narrative and moved _from_ Texas _to_ California. Funnily enough, people talk about the California-to-Texas pipeline as if it's a new thing, but it's been an observed phenomenon since at least 2005, and it's a lot smaller than the media would have you think (usually net ~40k year leave CA for TX, with about 80k going to Texas and 40k coming from Texas). That is 0.1% migration.
I've been in northern Nevada for the last 30 years and it's always been that way. When there's a boom in California it gets a little worse or the impact is felt a little more with things like housing, but it's not new. The best part is you get people that move here for the lower taxes complaining about the lack of services or the quality of the schools without the realization that those things are typically paid for with taxes. On the other side you have locals complaining about the "Californians" moving here and changing things to be more like California. I hear the same things from friends in Idaho that moved a decade ago to get away from the increasing housing costs here.
Again small anecdotal data point but take it for what it is worth.