It's a crap shoot, and the PAC is waiting for all TV offers, Big XII has a longer wait until 2025 renewal. It would seem everyone can wait a bit, but the PAC schools need to think twice and go while they can before the ACC explodes, only 8 schools needed and BIG, SEC, and Big XII would eat those easily.
Even if PAC numbers are similar, the BIG may have too big of a financial need for additions of WA and OR or they would already be there. ND hates the BIG and doesn't want to play SEC schools. Thus, the perfect storm for the Big XII.
My Predictions:
1. ND doesn't join BIG
2. BIG doesn't take any other PAC schools
3. PAC schools realize they will make significantly more in Big XII with best schools leaving and ND partnership (around double)
4. Before 2025 season Big XII adds AZ, CU, OR, WA and an ND scheduling agreement (possibly Stanford too)
5. Big XII pulls $70-75 mil/school
6. ACC schools can't take pay gap after Big XII expansion and 8+ schools seek way out as a pact.
7. SEC gets FSU/Clemson BIG gets UNC/VA/GA Tech/PITT Big XII gets NC State/Va Tech/Louisville/Miami
(Although I could see FSU and Clemson joining Big XII if money is similar with them)
8. ND enjoys scheduling alliance and new Big XII and still hates BIG and SEC and joins Big XII for more money.
9. Three super conferences.
10. 16 team playoff