Every form of declaring a college football champion has been broken, going all the way back to the Houlgate System first used in 1885. Why, because it has always been a voting poll declaration, of either who was declared the champion or who was declared good enough to play in a 2 or 4 team playoff.
The first question is where is the cutoff? Eight teams, sixteen teams or should it be all FBS conference champions. Which begs the second question, should conferences be re-aligned and independents eliminated? For true, playoff contention, every FBS conference champion should have a shot at the national championship. Again, requiring some management of what the conferences are.