I saw some numbers in the magazine, somewhere around 100 CAs and 100 FOs currently live in SoCal area. I figure after that first 100, it'll be somewhat junior based on cost of living and the fact that LAX (and associated airports) isn't any easier of a commute than LAS and it's prohibitively expensive to move out there.

Early "best guess" I've heard tossed around by people who have been here a while is it'll go junior by mid-2019.

But that's still just a guess.