I'll tell you what would happen, they would need two of FSU, OSU, and Auburn to lose on championship weekend (assuming voters would put a one-loss Bama in over the other one loss teams, which is realistic, though not guaranteed.) Whereas if they win, they would just need to win in the SEC title game to get in.
So in order for you to think that losing increases their shot at getting into the title game, you'd need to think that it is more likely that two of those three teams lose than it is that Alabama would beat whomever they play in the SEC title game.
The collective record of the four teams currently sits at 43-1. Do you really think it's more likely that two of Auburn, FSU, and OSU lose in their championship games than it is for Alabama to win theirs?