I guess it depends on who you are targeting. And this is where the NFL may be screwing itself in the long run.
It's just too expensive as a 'family' event. I still remember going to Mile High as child with my Dad (though I dragged him there... not the other way around as he wasn't into football) but nevertheless I have fond memories. Memories that made it sentimental to go to games as an adult. Regardless of how good the team may be at the time playing on the field. There was that 'connection'.
I must admit I haven't taken my kids to a game yet. Same with my friends in similar circumstances. Thus i doubt they'll have that same deep loyal sentimental connection going to live games as I do.