The Big XII can breath a little easier, at least for now. While Texas A&M wanted to join the SEC, the amount of obstacles potentially blocking such a move were too many to overcome. A 13 team SEC would present scheduling difficulties, a 14 team begs the obvious question "who would be team #14?" Then there was a minefield of legal difficulties, most of which originated from the Lonestar State.
So for now, Texas A&M will remain in the 10 team Big XII.
But I think eventually, the Big XII will be torn asunder. The Pac-12 must still be considering a move to 16 teams. The SEC seems to be thinking about the same thing. Missouri wants to be part of the Big Ten. And who knows, the Big East might want to cherry-pick another team from the Central Time Zone.
In a few years, all the conferences are going to look different. Originally, the conferences were formed based on region and size of the school, as well as how much focus schools had on athletics. Now, conferences are being reshuffled based on TV dollars. That's why the Big East snatched up TCU, why BC is in the ACC, and why the centrally located Big XII is being ripped apart.
One thing I expect to happen shortly is a process of shedding inferior programs. Conferences will drop the schools that can't make big bowl games, don't make the NCAA basketball tournament, and are never on national television. The SEC will drop Mississippi State, The Big XII (if it still exists) may drop Iowa State. The Big Ten may send Northwestern packing.
The age of the super-conferences will soon be upon us.