Jobs can move as well. And there's a good argument that more housing won't significantly ameliorate California's housing crisis: More housing results in lower p

Jobs can move as well. And there's a good argument that more housing won't significantly ameliorate California's housing crisis: More housing results in lower prices only if it reduces demand. But if the pool of people competing to live there is much larger than the increase in housing (drawn from the entire US, plus some immigrants), then it won't make a dent in demand, and the prices will stay high.