California has three industries that can't be moved: agriculture, oil, and shipping. You will find a lot of the sane people in California working in these industries. On the other hand, there is no reason that California's other economic icons, the film and tech industries, need to stay. I gather that California has been steadily losing market share in film production. Other tech hubs are rising around the country. When push comes to shove, the big tech firms can flee California just as easily as the big banks and financial firms can flee NYC. There are historical and cultural attachments, and logistical costs to any change, but these industries are inherently mobile.
Film production? Oh, California will retain the porn industry; the dingbat voters in that idiot state just voted in a statewide plebescite NOT to require porn actors to wear condoms. All the important issues are addressed in that state . . .
Where are you suggesting they would have to be moved to? Making California part of Mexico once again would not require any physical movement.
You will find a lot of the sane people in California working in these industries.
Sadly you will find far more that are not sane in California, and they do not work for these industries.