If you're asking this seriously... yes it is a barrier, but not as great as Immigration/moving to a completely new country.

Which is not to discount California's tremendous housing crunch. I am merely pointing out that its a much lower risk for a young single US citizen to just move to CA, try it out for a few months, if they can't get a job or make it, then just drive back. It is much harder for people from outside the country to do the same.