NASCAR attempted to do the same thing and it didn’t work out like they thought it would.
The result NASCAR got - Jimmie Johnson winning 5 straight championships, six out of eight, and 7 out of 11 - is exactly what's going to happen with CFB. It will not get EASIER for 1984 BYU types or 2009 Boise State types to win national titles, it has now become impossible. But it also is now EASIER for an Alabama or Ohio State to lose 2-3 games and win it all. And given the proposed gauntlet, nobody can say any champion didn't win it on the field.
That doesn't mean it made the SPORT as a whole better, though.