As a general issue, I think it is a LOT less likely for any team to win their first AP Title now that we have a playoff. I'll explain with two examples:
First, consider Iowa in 2015:
The Hawkeyes had a favorable cross-over schedule in which they played:
- 1-7 Maryland and
- 2-6 Indiana
While they missed:
- 7-1 Michigan State,
- 7-1 Ohio State,
- 6-2 Michigan,
- 4-4 Penn State, and
- 1-7 Rutgers
They had a manageable but not awful OOC in which they played two P5 teams (ISU which finished 3-9 and Pitt which finished 8-5) along with a horrible FBS team (N. Texas) and an FCS team (IllSt). They got to the B1GCG at 8-0/12-0 and ranked #4 in the AP Poll behind 12-0 Clemson, 11-1 Bama, and 11-1 Oklahoma.
In the old, pre-playoff days they probably would have been #2 behind only Clemson.
1997 and prior: In the pre-BCS days they would not have had to play a CG and would have headed to Pasadena to play a relatively weak Pac Champion. Then, all they would have needed to win an NC would have been to beat Stanford and hope Clemson got upset in their bowl.
1998-2010: In the BCS but pre-B1GCG days they would likely have been #2 and played Clemson in the BCSNCG. Then it is just a one-game shot. All they would have needed is one upset.
2010-2013: In the BCS/B1GCG days they would have needed just two upsets, a minor upset in the B1GCG (they almost got) and an upset of Clemson in the BCSNCG.
In the modern era they were nowhere close to a NC. They got to 8-0/12-0 but to win an NC they would have needed:
- A minor upset of MSU in the B1GCG (even here, they were VERY lucky that it was MSU and not tOSU).
- A HUMONGOUS upset of Alabama in the CFP semi-final. To illustrate just how far this was from reality, the MSU team that beat Iowa in the B1GCG got smoked 38-0 by Bama in the CFP semi-final.
- Another HUMONGOUS upset of Clemson in the CFPCG.
Several people have mentioned Oregon and the fact that they were "close" in 2010. Well, they were but the same issue applies for the Ducks. In 2010 the Ducks got to 12-0 and #2 in the AP Poll. That got them into the BCSNCG where all they needed was a win over Auburn. Again, look at eras:
1997 and prior: The Ducks would have headed to the Rose Bowl at 12-0 needing only a win and an upset of Auburn to win an NC.
1998-2010: The Ducks would get into the BCSNCG and need just a single upset win to get an NC.
2010-2013: The Ducks would have had to play a P12CG, then the BCSNCG.
2014-present: From the point that they got to 12-0, the Ducks would need the following to win an NC:
- A P12CG win,
- A HUMONGOUS upset over a CFP team in the semi-final, and
- A HUMONGOUS upset over a CFP semi-final winner in the CFPCG.
Oregon was close in 2010 but that same scenario today wouldn't really be very close.