There is no chance of balkinzation or secession of California unless the entire USA falls or splits. CA is the 5th largest economy in the world. That amount of wealth would never be allowed to leave. It'd make the entire South seceding look like a trial run.
Not that they'd really try without a dissolution of the Constitution first. They'd probably just start passing laws that ignore the Constitution and federal laws and then dare the fed to intervene. Would still need a massively weaker fed, though.