I don't think it's far fetched, but I don't want it to happen. LSU already beat Bama on the field, we know who the better team is. No since in playing it again.
With that said, best case scenarios is Arkansas beating LSU to finish the season and Bama being ranked higher in the BCS, thus going to the SEC championship game. That could springboard a BCSNC birth, but Bama NEEDS Arky to win and Oklahoma State or Stanford to lose.
Oklahoma State still has Oklahoma on the schedule and Stanford is playing Oregon this upcoming week I think.
Still a lot of games to play.