First, a lot of the Cal community cares about women’s and non-revenue sports, and would be really, really, vocally angry if the football program, after spending a half billion on a stadium it fills 50%, tried to force a merger that would have the volleyball team flying halfway or fully across the country for most away games. Some Old Blue football supporters might reluctantly go along, but the non-football Cal community is louder and probably more numerous.
Secondly, the stadium rebuild was a fiasco that really soured a lot of long time supporters. The costs were clearly more than the program could afford (and the tree stuff was not what drove them). Sandy Barbour, the AD, bought the sales pitch that seat licenses would help cover the shortfall. The seat licenses did not sell well, and many long term fans essentially got evicted from their good locations because they wouldn’t pony up the amounts being asked, and were really steamed at being asked to pay a license with really marginal upgrades for their experience. For most, the game day experience upgrade was that if an earthquake occurred during a game, they were less likely to die. Finally, the ask came when the team had gone to hell, along with the reports on poor academic progress. Like NU, Cal folks prided themselves on combining success on the field with success in the classroom. It honestly stung when the football team was at the bottom of the conference in academic advancement. It wasn’t everything, but it chipped away at the proud identification with the team.
Thirdly, the identity of Cal football, and the interest of most fans, is firmly rooted in its games against five schools: Stanford (by far and away), USC, UCLA, Oregon and Washington. If all five went to the B1G, Cal would probably want to go, but without a football only deal, I have no belief at all that they would.
What, by the way, was the USB reference in your comment? I assume it was a typo? USC is the university that is generally considered arrogant around here, with Stanford a distant second. Did you mean UCB for Cal?
I honestly believe the university would downgrade football before doing a full move to the B1G, and that is the alternative. All the other sports could survive in a west coast focused conference.