That assumes that enough legitimately pro gun people, who vote, and let people know how and why they are voting the way they do, move there to tip the scales in a wildy different direction.
Otherwise all they do is give CA more weight and leverage in the national stage because of their large population (example, more seats in the House, more electoral vote for POTUS)
It isn't necessarily a wildly different direction.
This is one of those areas where the outside view is often wrong. The average person hears "California has the most complicated gun laws in the nation" (true fact), and they translate that into "California has the most prohibitive gun laws in the nation" (I would argue that NY, NJ, CT, MA, HI, and IL are all more restrictive).
The reason California gun laws are complicated is that they have historically been full of compromises between the pro- and anti- gun sides. Of course that is breaking down, but California is still more gun friendly than many states.
The problem:
People who agree with stricter laws tend to be xenophobic and honestly believe that the other states, especially the flyover states, are filled with uneducated morons who alternate between attending church, abusing farm animals, and shooting at Bambi. They have zero interest in leaving sane California to live with yokels and yahoos.
At the same time those of us who disagree with stricter laws tend to be more open-minded, less xenophobic. We can accept things like the idea that there are high tech companies, and educated people, in places like Kansas and Texas. We are therefore far more likely to leave California.
As long as that remains the case, California will continue to suffer brain drain until the only people left are the fearful xenophobes who want to ban everything they don't like. Then the laws will be made simple and California will become in truth as bad as most on this forum assume it is.