There are only three schools with the option to jump--OU, UT, and MU. OU and UT are, at the very least, paying lip service to staying right now. MU definitely has some leverage right now. Whether or not they truly would jump, they can use the threat of doing so to get more of whatever they want (crystal meth, firecrackers, porn) built into the rehashed Big 12. A lot of the insiders on the boards I go to say many of the wonks at MU want out, so I think it's definitely more than idle bluffing.