Even with UCLA, USC is on an island. UCLA is just the anchor, and very lucky...
The XII should have stood down rather than offering schools like BYU, UCF, Houston, Cincy, etc.
They could have likely landed/merged with the PAC schools (XII already took 4 for them).
A PAC with USC, Washington, Oregon, Stanford and Cal (and Arizona, ASU, Utah, Colorado) would have fit nicely into the XII - or the PAC could have acted first and taken the best of the XII.
Terrible leadership out there doomed them. Larry Scott in particular.