Assuming that TCU promised them an exit fee if we didn't show up for 2012, and I think that promise was made,
why in the name of Heaven would TCU even consider trying to weasel out?
TCU deciders are big boys and girls, and they must have considered the possibility that the deal would come undone. Notice that the 27-months notice of intent to quit the league was negotiated OUT of the TCU deal for the Big East. "Ain't the same league we bargained for" is a b.s. argument. No league is the same from one year to the next, and how much it changes is a matter of degree. If we had gotten lucky, instead of losing football teams the BE might have added 3 more of the best.
In effect TCU bought an option-- we could, and probably still can, go to a Big East conference in 2012, and in return for their holding a place for us, TCU pays $5mm if we change our minds and everyone left has to re-do schedules to fill holes that TCU not being there caused. Joining the BE was a damn good deal when it was negotiated, and hind sight doesn't count.