Pac-12 set to add Boise, 3 other MW schools the oregon state AD said 9 would be 'ideal' for scheduling. that gives them 8 conference games (like most conferences) and only need to schedule 4 out of conference. having to schedule 5 would be a challenge.
i can't see any FCS school being Pac-8/9/10 ready by the summer of 2026, nor do i think any TV network is going to be excited about paying out to a conference where one or more teams wouldn't be eligible to play in a bowl unless the bowls run out of eligible teams. (like James Madison last year).
I'm certainly not against the idea of moving up IF i knew what we'd be moving up into. Ponying up a $5M fee to go FBS, and figuring out the money situation to add 22 football scholarships (and add a like number of women's, or get rid of some men's sports) to hopefully go into a Mountain West where you don't know who will be there? Will Air Force join the PAC, or join up with the other service academies? Will other MWC join the PAC, or leave to the Sun Belt or AAC? Are you looking to join a conference that has a core of 4 or 5 teams? Its a huge investment for a huge unknown.
Sounds like the Pac was exploring this move prior to the final announcement of the corner schools joining the Big12. They maybe could have retained Cal and Stanford, giving them as much TV money as they are getting in the ACC and a better path to the playoffs. But, they sat and waited...and.....here we are!