From my last post:
"I'm just for including teams like 2016 WMU, 2017/18 UCF, etc. in NYS bowl games and, if there is one, an expanded playoff. I don't think there should be a guaranteed spot for the best non-Power 5 team, but there should be if the best of that litter meets a certain threshold (undefeated and/or ranked #XX or better, etc.)."
So I don't think an eight-team playoff should automatically have a non-Power 5 spot, but I do think that a NP5 team should get an auto spot if it meets a strict threshold/criteria such as being ranked in the Top [pick a number].
It's pretty silly to say 2017 UCF didn't belong in an eight-team playoff last year considering it beat Auburn, who was #7 in the final CFP rankings and entered the SEC Championship Games ranked #2. UCF five one-loss teams, five two-loss teams and a three-loss team in the final CFP rankings. It then beat an Auburn team everyone was fine having in the CFP with two losses.