Does climate change play an unspoken role in this? Is California is an increasingly unstable place from an ecology perspective?
https://www.keranews.org/2019-08-22/austin-makes-top-10-list...
And unfortunately we have our share of deadly wildfires as well (https://en.wikipedia.org/wiki/Bastrop_County_Complex_Fire), although thankfully not to the same degree that California does.
One of the more common reasons people are leaving CA is retirement. In the 90s and thousands, it was pretty popular for people to move to Sacrament (Granite Bay and Auburn) to retire. Today it's Tahoe and out of state. People love to retire in the forest, but if it's going to light your house on fire, people will look elsewhere.