We have already started to see what we are to expect from the conference realignment. When Fresno State and Nevada left the WAC, the WAC was left with only six teams, and they had absolutely nowhere to look for new teams from the football championship division(FBS).
If the WAC wants to continue being a conference in the football championship division, they must look at all of their options. Assuming that they will not be able to steal any teams from the Mountain West or Conference USA, their only option will be to promote the better west coast football championship subdivision(FCS) teams. That list includes: Cal Poly, Montana, Webber State, Montana State, Portland State, and Idaho State. Giving them 12 teams and the option of having a conference title game.
That group of teams keeps the travel low for the conference, and gives you some natural rivalries. Also all of these programs are near the top of the FCS.
As for when the Pac 10 makes an offer to Boise State and the Big 12 takes TCU, the Mountain West could also look to promote teams from the FCS, but what is much more likely is that they will either attempt to take more teams from the WAC. I have no idea who they would take; however, the team that makes most sense is Hawaii.
After bringing in Hawaii, they may still want to add one more team. Now they could attempt to bring in the University of Texas El Paso, which will most likely work for both sides.
In addition to the Big 12 adding TCU, they will probably look to bring in one more school. The second team being added to the Big 12 will most likely be Houston. Houston brings very solid football and basketball programs.
Losing Houston leaves Conference USA looking for one team to add. Since they have no other option but to promote a FCS team, Stephen F. Austin will get the call up.
Seeing that they need a conference championship game the Big East will have to look to bring in four more football programs. Since they already have sixteen teams for basketball, they will look to bring those who have football into the league. The one obvious team will be Villanova, who is a top FCS program. As for the other three teams, they will most likely have to attempt to steal teams. and this whole process will just continue and continue.
That whole process will just continue and continue until we have very little identity left in each conference. I think the realignments are inevitable, and will cause many of the better FCS programs to play with the big dogs.
The promoting of FCS schools is only possible due to how many great athletes america is producing these days. If you were to go look at the recruiting classes of the best FCS teams, you would find that they get really good players that slide through. If we're having good to great players sliding through, I feel like we have an obligation to give them the opportunity to play at the highest collegiate level.