If they need 9, they'll have a hard time dissolving the Big 12.
But the info I've seen (and confirmed) is that the Big 12 was incorporated under Delaware law, which requires only a majority to dissolve a corporation.
If this is true then that's only 7. Which would be Colorado, Nebraska, Texas, Texas A&M, Oklahoma, OK State and Texas Tech.
If that's true then the Big 12 will be GONE and no exit fees will be paid.
This is the most likely scenario unless there's some detail missing.
My guess is that even if the vote is 9, the schools bolting will enter into a financial agreement where they pay less than the exit fee to the remaining schools so everyone votes to dissolve the Big 12.
And voila, no more Big 12.
Also, if the Big 12 doesn't go away as an entity I doubt that they'll be sitting pretty.
You can bet that all their TV deals will be renegotiated and their TV money will take a significant hit. Same for the bowl tie-ins.
A conference without Texas, Nebraska and Oklahoma is just not as attractive.
And there's no guarantee that a they'd be given an auto bid to the BCS -- if there's even a BCS left after all this conference shake-up...