If Texas A&M heads to the Southeastern Conference next week, the conference shuffle will start all over again.
Likely, the SEC would want to get a fourteenth team for the sake of balance. It will likely go after Florida State or Clemson from the ACC, or Missouri from the Big 12. Right now, Mizzou says it is committed to staying in the Big 12. Other sexy additions could be Louisville, Georgia Tech, or Virginia Tech. Any of these teams would geographically be a good fit for the SEC.
To replace the Aggies, the Big 12 would likely go after Houston, Texas Christian, Southern Methodist, or BYU. As long as Texas and Oklahoma stick together, the conference could probably survive in some form.
The Big Ten and Pac-12 could expand as well, but that won't likely happen unless it becomes apparent alot of dominoes start falling and these conferences need to go on the defense to stay competitive with a superconference consisting of either fourteen or sixteen teams.
The Big East and ACC sit in a precarious position. Both could get poached from. They are both seen as more of basketball conferences rather than football conferences. Keep in mind that college football generates more money than college basketball. The Big East needs to get on with expanding to ten teams if it wants to ensure its survival. Moving Villanova's football program up from the FCS to the FBS would require a much larger stadium than Villanova Stadium, and it looks like the Wildcats either don't have the space and/or money to expand their miniscule 12,500-seat stadium. Using Lincoln Financial Field, where the Philadelphia Eagles play, for home games is not an option; Temple uses this stadium as its home field.