The Federal Government owns 45% of all the land in California. I doubt that the Feds would gift this to the Golden State.
Let them secede, but destroy every dam, aqueduct, powerline, or any other form of infrastructure that was built by ‘mericans. Also completely block all water from the colorado river to the imperial valley. Also northern Nevada must sue for damages each and every day that our air quality is wrecked due to fires because of their krap forestry practices (sometimes you cant even see the sun for weeks at a time), and we need to charge carbon taxes for each estimated ton of carbon dioxide released into the atmosphere because of said fires