Newsflash, I know a lot of Pilots don’t want to hear it but, if the SAN “takes off (aka: is successful)”, the SFO base will surely close!
The reason very simple: COST!

There is zero chance that DM keeps talking about “savings, savings, savings” and yet turns around by opening a base which requires a lounge, a Chief Pilot, an Admin etc., etc., hence increased cost. It just doesn’t make sense and it’s not how AS operates!