I think the college fans are far more rabid. Outside of criminal activity of Raiders/Chargers or Steelers/Browns, it is just not that dramatic. Tuscaloosa, College Station, Happy Valley (they will go to their grave excusing Paterno), Ann Arbor, Austin, Columbus, Eugen, Norman....there is a reason the show Game Day exists, and one does not exist for the NFL. Seriously. Bronco fans are far more loyal than are Rams fans (in StL). The Rams were like step children to the Cardinals.
I love the NFL, but they better pay attention to American consumers.