Yes but....
To reclaim California, there must be the will to do so. If the consensus is that America is better off without California, there will be no effort to enforce the court decision to drag the crap back into the Union.
Disclaimer: yes, I know that musc in fact most of the geographical area is not all that bad, and is in fact good
We need to figure out how to keep California but eject the nutcases. They’re highly susceptible to propaganda; maybe we could persuade them all to move to North Korea or Venezuela or Zimbabwe.