Well, with the way this year has been going, anyone could end up playing for the BCS title.
It almost seems like being No. 1 is a curse, which will probably haunt LSU. First USC lost to Stanford, then LSU to Kentucky, and finally Ohio State to Illinois. LSU will most likely lose to Arkansas, seeing as how their only other game is against Ole Miss.
Oregon has two games remaining—Arizona and Oregon State. Both teams have a good shot at beating Oregon, or at least putting up a good fight. One of them may cause Oregon to lose their shot at a BCS title.
Kansas has been the Cinderella story of the season. Although they still have to play Iowa State and Missouri, they are 10-0 right now, after having a 6-6 season last year.
Assuming they win their next two game, why shouldn't they play for the BCS title?
Well, had they played some tougher opponents at the beginning of the year—instead of teams like Central Michigan, Southeastern Louisiana, and Florida International—they may have a better argument. But if they have big wins against Iowa State and Missouri, and win the Big 12 title game, they should get a shot to play for the BCS title.
If Kansas and Oregon/LSU lose, Oklahoma or Missouri would most likely play for the BCS title, depending on who beat Kansas. If Missouri beat them in the regular season, they would also have to beat Oklahoma in the Big 12 title game. If Oklahoma beat Kansas in that game, then they would be in the BCS title game. This is, of course, assuming that Oregon or LSU were to lose.