The only thing that makes sense financially is the creation of an entirely new conference including selected members of the ACC, B12, and PAC. In the process of forming the new conference all three jettison the dead weight that decreases their value.
The new conference would offer multiple teams with a history of being top 25 teams, even if some are temporarily down. This would include FSU, Miami, UNC, WVU, Okie State, Kansas State, Utah, Oregon, Washington, etc. This would have value to the TV networks that simply expanding the PAC (or the B12 or ACC) would not give.
Done right the conference ends up with 16-20 teams covering all time zones and including some interesting rivalry games.
All of the other suggestions I have been seeing here result in a lot more pieces coming out of a pie that doesn't get much bigger resulting in smaller pieces for existing members.