Stanford lost. Boise State lost. The only unbeatens left are LSU, Oklahoma State, and Houston. With Houston's schedule, they're not going to get a national title shot without lots of help. So the Championship game will be LSU's stifling defense (allowing 10.7 points per game), against Oklahoma State's relentless offense (scoring 51.7 per game). Unless either of them lose, of course.
And that's possible. LSU still has to play #6 Arkansas. Oklahoma State must face #5 Oklahoma. If either team fails to win these big games (or any other game), then the BCS becomes a mess. And based on the history of the BCS, I think we're destined for a mess.
If Oklahoma beats Oklahoma State, how do you shut them out of the title game? How about Oregon, who only lost to LSU? What about Alabama, who only lost to LSU? Then again, if your only loss is to LSU, doesn't that mean you had an opportunity to win a title shot and failed? Is it more damaging to lose to a contender than it is to lose to a random team like Texas Tech? Should it be more damaging?
If LSU and Oklahoma State run the table, then the BCS has done its job. If not, then a playoff would be the only answer to solve the National Championship puzzle.