B10: Oregon, Ohio State, Penn State all for sure will make the playoffs. Indiana will very possibly will only have 1 loss at a top 3 Ohio State, which will be a 'better' loss than anything BYU will have.
SEC: Georgia, Texas, LSU all likely. Tennessee is a possible addition.
Notre Dame. The committee has shown year-after-year that ND gets preferential treatment. It'll be interesting to see how the Committee places them in the 1st week of the college football playoff rankings. If ND is high and goes undefeated the rest of the year, I'd bet the committee just happens to rank a 1 loss BYU team *just* below ND.
G5 highest ranked: Boise State likely, put anyone here as it's contracted for the G5.
Big 12 Champ: If not BYU, this is going to be sticky.
ACC: Miami and Clemson. They're not great teams, but they're already ranked way too high and they'll very possibly not lose.
In this scenario, we already have 13 teams above with legitimate claims on the playoffs (not including BYU). We'd have to remove two of Tennessee, Indiana, and ND to make the playoffs. Not totally impossible, but by far from a guarantee. The SEC/B10/ND influence is significant.