How about if a company is taken over? Should I be “forced” to work for a company I did not decide to work for?
That's not what causes loans to be transferred to others in the vast majority of cases.
(This is about as convenient, pleasant, and useful advice as the "just quit your job" advice).
Note that your first mortgage in CA is nonrecourse, but a refinanced mortgage is not nonrecourse (meaning the lender can come after you personally if you end up underwater).