I'm sitting in one of the really small rooms in my house and a thought occurred to me. I'm not sure if it's good or bad, or how likely it is. However, given what has happened in recent years it seems like this actually could happen:
The ACC grabs WVU (makes sense because, let's face it, WVU in the Big 12 is a dumb idea)
B10 grabs OU and KU (makes sense, not geographically, but because they want 16 teams and access to the OKC, DFW & KC television markets.
UT, OSU and KSU can't go anywhere because nobody really wants them.
The B12 is left with UT, TT, Bailer, TCU, OSU, KSU and ISU. All of those schools, with the exception of ISU, are legit P5 schools. They just have academic, geographic or cultural issues that keep them from moving into one of the major conferences.
UT looks at what is left and gathers it's minions together. They have to add another five teams. Three won't do it. They need the exposure that a CCG will give them. Their choices are among the following: Houston, SMU, Rice, UNM, CSU, BYU and Boise. SMU and Rice add nothing in terms of fan following, prestige, history (or in the case of SMU - positive history), or television sets. The other five get in.
This is how CSU ends up in the Big 12.