I’m totally against Calexit - the cost to extend The Wall would be exorbitant, this is, unless we can make California pay for it.
I think San Diego would vote to stay, as would most of the State.
Los Angeles and San Francisco would vote to secede.
Maybe it would work, if just Los Angeles, Ventura, Santa Cruz, Santa Clara, Alameda, Contra Costa, San Mateo, San Francisco, Marin, Napa, and Solano Counties seceded, and all the rest voted to remain with the U.S.
Militarily, it seems unworkable. But, the “Progressives” have never let reality interfere with their schemes before...