Just to clarify, a lot of people have suggested that Nebraska should just tell Beebe that they are committed to the Big 12, but then just leave whenever an actual better offer from the Big 10 comes along. Beebe has said that he would require a signed legal document from the schools in question that would legally bind them to the Big 12. So it's not realistic to think Nebraska could just tell Beebe they're committed with their fingers crossed behind their back.
Of course, the problem with Beebe requiring Nebraska and Mizzou to sign a legally binding document promising not to leave the Big 12 is that the Huskers and Tigers would then be putting themselves in a VERY precarious spot sitting on the sidelines hoping that the Big 12 South doesn't bolt for the Pac-10. Unless, of course, the document is written in such a way that would allow NU and MU to leave if Texas left, or 2 or more schools left, or something to that effect.
But I agree with those on here who have said that singling Nebraska and Mizzou out in this ultimatum is just another example of the Big 12 treating Nebraska and the rest of the North unfairly by trying to set it up to look like it was Nebraska and Mizzou that caused the demise of the Big 12. If I was TO and Perlman, I would be honored that Beebe gave me the shotgun to put down this lame horse.