Why exactly, at this point, do you 'lose the chance to invite someone'?
We've passed the point where these conference sizes make logical sense for scheduling anyway. So the idea that a conference is ever 'full' is past us. Conferences are just media-aggregation agreements at this point. If those ACC members make sense as adds in the future, they'll be added whether or not we have 16 teams or 20 teams then.
There's no way the B12 is going to take all of the remaining Pac 4. They should be looking East for future expansion. Maybe they take Stanford in 5-6 years if paired with 3 schools on the East coast. But that's it.
On one hand I think its a terrible Idea to add more Pac schools, on another I think its a good add, and on a third hand I dont really care either way.
I dont think there is a high likelihood that the B12 adds more Pac schools, but if the rumors are true there is at least some chance.
I feel for it to happen the media partners need to be on board or a new one allowed to make the money make sense. From what is rumored at least ESPN is on board.
If ESPN, Fox or another partner jump in and are willing to pay, and those 4 are willing to possibly take a smaller share than I dont see a huge problem. What I dont want is for those 2-4 to come and reduce our share.
What if Espn says they will pay their $20M share for those 4 and they agree to come for that, and No Fox money? Everyone else stays at their current level and those 2-4 get 20M per year for the remainder of the contract.
What if another partner comes in and it actually increases our pay.
What if ESPN agrees to pay 75M for Stan and Cal, (what is rumored was close to the offer for the ACC )and the B12 gives them 20 each and splits the remaining 35 among the other 16. That could make up a bit for the loss that we took for not taking a full prorata adding the last 2.
I think there are scenarios that make it make sense, and some that dont. I feel BY and the presidents are not going to take less to add more so for it to happen some media partner is going to have to make everyone whole or sweeten the pot.
But I also agree with
@alarson that at this point adding 2-4 more doesnt change our option to add up to 4 from the ACC. I believe if the ACC does fall in the future the B1G, SEC and B12 will all be in the 20-24 team range. So if we take as many as all 4 of the remaining PAC we still could add 4 ACC schools. At that point I have a hard time seeing going beyond 24. And after the B1G and SEC take their picks from the ACC I am not sure there will be more than 4 desirable teams left.