It's now the Pac-4 where will Cal and Stanford go? I think Stanford and the other 3 really don't have much choice with football, probably Mountain West for them.
However, if I take a UC Davis-centric look at this I think there needs to be a massive reallignment. I would break up the Big West, West Coast, WAC, Pac-12 in favor of a more geographically-favorable set-up.
First of all the PAC-whatever conference would no longer sponsor football due to too few teams.
I don't think it's any secret that the Big West has at least 1 too many teams and the members would like to not have to travel to Davis/Hawaii. The WAC conference is also too large and it consists mostly of Texas schools and a bunch of misfits, especially for baseball. Seems like it's half Texas and half orphanage. The Mountain West seems like it has too few members.
Breaking up all the conferences (or at least chipping away the non-Texas schools away in the case of the WAC) is a lot easier in theory than grouping them together again. Where I would like to see a purely geographical grouping I realize making conferences that way seriously limits their ability to market and recruit, so I won't bother imagining who would be in each conference. However there are some schools that just need to be together and aren't like UCD and Sac State and UCD and CAL.
I will say that I would like to see UCD play teams I care about more often. Too many games against UC Armpit and Cal State Nowhere. In my opinion it's a travesty that so many contests against Sac State are played mid-week.