A big issue is the length of games, or rather, the length of broadcasts. Games have continued to lengthen due to TV, commercials, etc and the finger is always pointed back at the sports themselves. How many games have we gone to where a team scores, a commercial, come back to a kickoff, commercial, 3 plays and out, commercial, turnover, commercial. And those commercial breaks have gotten longer.
I know it will never happen, but it would be nice if more sports went to the soccer model and just rotated ads while the game played out on TV with minimal breaks. I bet you'd see a lot shorter games and a lot more interest from the younger generation.