Cali represents far too much GDP, far too much raw valuable coastline to ever let go. It would be cheaper to kill every last man woman and child in the state, and repopulate it, than it would be to let it secede.
Never mind what Lincoln knew... if one goes, the union will wall.
Personally, I would not want to live in an independent California. I love everyone's good ("bleeding heart") intentions, but our legislative system seems fatally flawed.