I hated the 4 team -- lots of years the 5 or 6 would have had a real chance at beating the 1 2 3 or 4. And having to go 10-3 with a decent strength of schedule is hardly "weakening". To have one loss take you out is it not good. I loved seeing the Giants beat the Patriots. If you just want the regular season best win-loss then no need for a playoff at all - just go back to the pre-playoff days.
I have said they should flip the format between FCS and FBS. In FCS 24 teams go, but there are only 6 programs in the nation that have even a 1% chance of winning with 2 of them having 95% chance. There are almost never upsets in the first 3 rounds. It is a waste. Where in the FCS I do think top 16 or 24 would make for some really fun upsets. The nice thing about 24 is that Army would get to play ISU first round, not Oregon, so you actually have some decent first round games. Plus, more games at home stadiums are super fun for the fans.