The way I see it, of the 4 BCS at-large spots, the SEC definitely gets one, and Houston almost certainly gets the other (even if they lose to Tulsa, they'll probably finish top 16 and win their champioship, so the only way they don't get in is if they lose to Southern Miss in their championship).
So, that leaves two at-large spots up for grabs. Currently, those have to be held by Stanford/Oregon and Michigan.
So, we first need to open up one of those spots for OU/OSU/KSU, which means we need Michigan to lose Ohio State, or Oregon to lose to Oregon State. (Or, I guess, Houston loses to Southern Miss in champioship, but that's even less likely).
Then, we just need OSU to crush OU. If all that happens, the Cats are BCS bowling, right?
I wouldn't even be considering this, but for all the crazy upsets this past weekend.