The issue to think about with Cal, Stanford, UCLA and SDSU is there are almost no actual real fans. I'm not far from the Rose Bowl and you'd never know a game is being played compared to how Ames turns into a carnival celebration every football saturday. I happen to have Stanford, UCLA and SDSU alum friends/coworkders, I know way more about their teams than they do. They don't even know when they make the Final Four.
Even SDSU is a better school than people realize, and those other three are globally elite. It's time to ask what that really does or doesn't do for an athletic conference. My guess is not nearly as much as was always thought.
UCLA is going to be playing road games at home in the Big Ten for a few seasons with people turning it into a fall vacation. It's a stunningly beautiful place, great area, perfect fall climate and no locals show up to games. SDSU would be the same way in the Big 12. Not sure if Big Ten/Big 12 fans would make vacations for Cal/Stanford.