One would be assured a spot... the other would have to leave its fate to the committee as a wild card?
I agree with that. But the poster I was replying to said it should be a 16-team playoffs with each of the 5 power 5 champions making it. Someone asked how they'd get the other 11 teams and the poster said "maybe let the top 2 teams from each conference make it." Which would basically make the conference championship useless.
I wanted to comment on your idea about the 5 power 5 champions and Notre Dame getting a pass into an 8-team playoffs. I agree with all of that except Notre Dame. I do think the 5 power 5 champs should make it. I also would like it if a non-power 5 team was guaranteed a spot. The only issue there would be how would you determine which team?
1. the highest-ranked non power 5 team at the end of the season?
2. the highest-ranked non-power 5 champion (which would almost always be the MWAC champion; which then would basically just make the MWAC a power 5 team)
3. should you take independents into account (otherwise, Notre Dame would almost always make it if they had a halfway decent season)
I think Notre Dame should just join the Big 12 if they want a shot at the playoffs. Otherwise, they need to basically run the table like they did a few years ago.
Anyway, I'd also have the final 2 spots be the highest ranked teams remaining. This way, Notre Dame could still make it even if they don't play a conference championship. Then you have situations where a top team that lost its conference championship could still make it. Such as years where a 12-0 team loses its conference championship to a 9-3. Sure, the 10-3 is in the playoffs, but the now 12-1 isn't penalized on a perfect regular season.