more commercials because of increased replays. more and more injuries to star players hurting the talent level. the resulting increase of rules that limit the game to try to make an awfully dangerous game less so. too much parity. too many playoff teams that generate revenue because of more games but make the regular season matter less (see 9-7 team winning the super bowl).
if you dont think these are concerns i dont kno what to tell you. my friend group in college consisted of a bunch of huge sports fans that entered college big nfl fans (went to the bar to watch games, wore team merch, etc) and almost all of us barely even watch on sundays these days. yes, more chicks and "average fans" are around now than 5 years ago, but i know a large number of football fans that just dont care about the nfl anymore. you may, others here may, but i dont think the sport is trending in the right direction with everyone.