Isn't that interesting though, and we all do it, how a team gets that benefit of the doubt, season-to-season?  The '96 Huskers ran for over 100 yards less per game than in '95.  Moreover, they averaged nearly 2 yards less PER CARRY in '96.  That's enormous.  So while the defense remained great, the offense was a far cry from the year prior.  
Meanwhile, Florida tightened things up on defense in '96 and the offense was still great.  
This reminds me of a study I want to do on peaks within programs.  Not by season record, but by pass/run offense and pass/run defense.  Like how long does it take opponents to find a way to combat a part of the game you've learned to dominate and/or do the players leaving or coming in dictate success in a particular portion of the game?  Does either situation occur more often than the other?  Is there an average number of seasons a peak lasts?
And connected to that, possibly, is how certain "great" players may hinder team success.  When the HC caters to his top player - just because you have a stud RB, should you give him a ton of carries when you otherwise wouldn't?  If you have a great WR, do you pass too often because of him?  Things like that.