I don't see Texas going to the SEC or B1G. I think they will end up in the ACC or Pac12. OU probably goes SEC and may bring OSU with them. KU to the B1G.
ISU will likely end up with KState, TCU, Baylor, Houston, Memphis and whoever else gets passed over. I would assume we keep the B12 name but won't have B12 money any more.
I don't see Texas going to the Pac 12. The money gap is will probably be about $30m in 8 years. Is Texas going to the Pac 12 going to make up that gap? They are more likely to go to ACC if they leave.
I also don't see OSU going to SEC if OU goes there. SEC would rather expand their footprint by taking teams from 2 different states instead of 1. So look for West Virginia to be the 2nd.
So IF (still big IF), the Big 12 blows up, the most likely is:
Texas to ACC
OU and WVU to SEC
KU to Big 10
So in that situation, ACC would need another to keep their conference even. Notre Dame could be the 16th, but I don't think they will ever join a conference in football.
Big 10 would need another. Who is left that has the academic profile that fits the Big 10 and is in a power five conference and already draws over 50k right now in football and would be available?
1. Iowa State
2. Pac 12 teams
3 SEC Teams
Pac 12 teams are not likely due to geography
SEC Teams are not likely due to being in the SEC; however, Missouri is not completely out of the question especially if Kansas is one of the teams.
So lets say ISU does not get into the Big 10. The question is whether the Pac 12 wants to join the super conference race and expand. Who would be left for the Pac 12?
1. Big 12 teams (ISU, KSU, OSU, Tech, Baylor, TCU)
2. G5 teams
3. Big 10 and SEC Teams
4. BYU
Big 10 and SEC teams are not going to the Pac 12. The money gap is just too wide. The Pac 12 could add G5 teams, but why aren't they adding them now if they are attractive. So the most attractive are probably Big 12 teams.
1. BYU, Baylor and TCU will not go to the Pac 12. Anyone who suggests that needs to learn a little about the Pac 12. They don't want a religious institution in the conference. Also, Tech and KSU don't fit the academic profile. That leaves OSU and ISU. ISU has the better academic profile. ISU has a strong following in football. They add a new state which increases the footprint (which is a disadvantage of Big 10). Conference won't look at wins/losses, they will look at whether the team has eyeballs. Iowa State has shown that they have more fans than the other options.
So I am not concerned about whether Iowa State will end up in a power conference. I think that Pac 12 will be an option if OU and UT leave. ISU will remain one of the best options.
If you allow some of the G5 schools in the Big 12 now without a GOR and they build the infrastructure up to the level of ISU, then that is when we are in trouble.