Many of those people will GTHO beforehand, and they will be amongst the most productive Californians
Also, sections and counties will not go along with it and will proceed to become states (or allow annexation into adjacent states) #Calexit assumes its makeup will not change. It will. Dumbass hippies and freeloading illegals will make a mad dash for it while the good and productives will bolt like lightning
An independent California will be little like the organizers envision it.
Ahem, my son says Colorado, Denver area is being inundated with ex Californians.
Taht is why Colorado is being ruined. After they ruin Colorado, where will they ruin next?
An independent California would probably be instantly engulfed in civil war as the Enclaves try to retain control of the agricultural areas. The Tekkelites would have a vast amount of manpower to draw on for troops but the Americans would have most of the guns, at least at first.
As a lifetime California Citizen, the Calexit folks can go to hell.