As to the 4 mega-conference 16 member stuff, what would the PAC12 suppose to do, add Miami, Pitt, Syracuse, & BC? These sling-shot tactics trying to please TV network executives may end up backfiring and diluting the product.
Concerning the PAC-12. They have no reason to expand, they can sit back, wait, relax. If the time comes when 3 16 (or more) team super conferences start imposing their will on the NCAA, then the PAC-12 will be in perfect position to invite ND in. With them, BYU, Boise State and maybe Hawaii could be invited in.
Going by the pods they wanted to set up last year, they could do something like this:
Pod A: Oregon, OSU, Washington, WSU.
Pod B: Boise State, Colorado, BYU, Utah.
Pod C: Stanford, Cal, Arizona, ASU.
Pod D: USC, UCLA, Hawaii, Notre Dame.
This would give ND at least one game a year in California, something they want. They could keep their yearly game with Stanford, as an out of pod lock in? It would mean every other year all those rich ND alum can plan a nice relaxing trip to Hawaii. The LA to Hawaii trip is a direct shot, travel for sure, but to Hawaii? LOL!
It would also mean these wonderful games over Thanksgiving!
If I'm the PAC-12 I just sit back and see how this all plays out. I would also send an open invitation to ND, letting them know they are welcomed whenever they are ready.