The point of the season isn't to make sure the best two teams play in one single game. The post season is great fun but it really just icing and typically isn't even the best games of the year. Despite all the hype the regular season is the heart of the NFL not the few games at the end. It is also so where the drama is for the greatest number of fans and most teams make most of their money so don't expect the NFL to make changes that will make a large number of late season games irrelevant.
I was born a Cowboys fan and I have watched them win a lot of post season games including 5 Super Bowls but the game I enjoyed the most is when a terrible Cowboys beat the Red Skins in a regular season game. Take away the divisions and you take a way the rivalries. Football would not be as much if you didn't rivals to hate. Sure I hate the 49s because the Cowboys met them so many times in the Championship game but anywhere near as much as I hate the Giants.