The Big 12 is the only other league that could possibly get 2 teams in the playoff, IMO. There's an argument that a 2-loss ACC runner up could sneak in, but I just don't think they can overcome the SEC bias.
Now, I'm rooting for BYU to win the conference of course, but if we go undefeated and then lose in the CCG (going 12-1), that poses the biggest threat to the at-large Big10/SEC teams. The committee is then forced to show their hand. If BYU were left out, it would just go to show how big of a farce this whole thing is.