Pac-12 set to add Boise, 3 other MW schools Sac left for D1 in 1991 I believe. It wasn't the end of the world for UCD. UCD caught up (beating them routinely all the while).
It took Davis 12 years to catch up and announce a move to D1....If Sac moves to FBS, it might take Davis a decade or more to catch up again.