Coaches from 103 of the 128 FBS schools voiced their opinion in an ESPN poll about the College Playoff system. 44% of those coaches would prefer an 8 team playoff system while 29% were okay with the playoff system now and 17 % wanted to expand to a 16 team playoff.
The coaches who want to expand to 8 teams would like to see the Conference Champions from the Power 5 conferences, (ACC, Big 12, Big 10, SEC and Pac 12) automatically in and the next 3 highest ranking schools make it.
An 8 team playoff would make more sense. Just this week Jeff Long, said that the difference between #4 and #7 teams was very narrow. An additional game for the playoffs might mean that conferences would play one less season game which might mean less of the "easy" non conference schedules that some conferences are accused of scheduling. It could also mean a conference championship game for the big 12 to eliminate Co-Champions as we are likely to have with Baylor/TCU this year.
All-in-all it will come down to the money. Given enough money even ESPN, which is in the first year of a 12 year deal for the current system, might consider an 8 team playoff.