Well, this is exactly what people were b*tching for . . . an expanded playoff system (which accomplished little, IMHO). And now, what do we have? People still complaining . . . for the same reasons.
The direction they're going to have to go, is to take all P5 champions (plus an independent/at-large/undefeated mid-major), and use the conference championships as a means of a "play-in," for determining the NC. You don't win your conference championship, you don't get a seat at the table.
OU or OSU will have a legit "complaint" if they're left out. As will representatives of the Pac-12 . . . again, IMHO.
Although, this year that scenario wouldn't necessarily solve the problem. ND is in as an independent, and we have the same situation with UCF undefeated, and people complaining they should be in (although, there's no way they survive with an undefeated season carrying a P5 schedule).