1. The SEC & B1G, if they get their way, would automatically get a total of 8 bids (4 B1G, 4 SEC), so the rest of college football has 4 remaining slots.
2. 3 of those 4 slots go to the highest rated non-B1G & SEC conference champs, which leaves one at large slot
3. ND has to have a higher rank than all other teams not already in playoff (so likely vs. #2 team from ACC, #2 team from BigXII and the second best Group of 5 team.
4. In addition, ND will never get a bye. That only goes to conference champions.
Realistically, I think this drives the playoff to be expanded to more teams...but if it isn't an independent team like ND will have a tough row to hoe to get in.