Hopefully we just win out and don't have to worry about it. Lose to ASU and we are likely out, so I am not worried about anything except beating ASU at this point. 10-2 and you miss the CCG and BYU will have very little shot at making the CFP.
11-1 + a loss in the CCG seems reasonable that BYU would make it into the CFP, but I wouldn't feel super certain in that either, the way the committee has rewarded some teams with 2 losses and 1/3 of the season to go.