1) While it may individually be different as we grow older, generally it is no different than it has been for the past 40 years.
2) True, but the old people are not the problem. the blue hair sections are still packed, while seats in the student sections remain empty.
3) I agree. TV is way better today than it once was. It does not replace the game day experience, but it has become a very viable option that is favored by many. I believe this is one of the main causes.
4) I seriously doubt there is the cause effect relationship about religion that you state, especially considering attendance nationwide is down.