I think an equally relevant question is “can states AFFORD to secede”?
In the case of California, where I live, CA would sink to the bottom of the Pacific Ocean if it split, financially speaking.
You are absolutely right... just one of the many reasons why it would be a dumb idea.
I'm certain that were a groups of states to secede, they would refuse to admit California to their membersip. CA is the problem and its people cannot be part of the solution until they learn that socialism and communism are evil and incompatible with success and with human nature.
Similarly, MD, MA, IL, NY, and the other far left states would be unwelcome in a free union until they learned to abandon their dreams of a People's Republic.