The ONLY way to have a true National Champion is to determine it on the field.
Get the right people on the selection committee and have a 4 team playoff. Select the BEST 4 teams. Nevermind conference lines or whatever.
Put the 4 best teams in a playoff and let'em play!
Yeah sure. Who are the "right" people on the selection committee? It's far to subjective and 4 teams is too few.
The only real way to have a "true" national championship is by going to a 32 team tournament that takes place over 4 weeks in late November and December- we go from 32 to 2 in 4 weeks. With the Final 2 teams playing on the second Sunday in January. The losers can play in Bowl games between Christmas and New Years day.
Why 32? Why not 64 or 128 or 16?
Because it fits the calendar.... that's really the only reason. Personally, I like the bowl system. I really don't care which team is the "national champion".