* Electronic ball-strike indicators in Major League Baseball, similar to how tennis uses the fault call. I'm sick of "special" pitchers and large-market teams getting larger strike zones.
* A taunting penalty for every player who hovers over a prone player after a tackle. You're ****ing paid to tackle. Stop acting like you made a tremendous play.
* After the final day of the NFL, re-seed the teams based on record. It's idiotic that a 12-4 team has to travel to play an 8-7-1 team on the road.
* Reorganize all major colleges into conferences of 16 teams, with two divisions of 8 teams each -- based on geography (insomuch as some conference may come up short). Each division winner plays for the conference title. Each conference champion makes the bowl tournament to determine the nation champion.
* Get rid of the AP poll. I'm tired of unranked teams remaining unranked after defeating a top-15 team, while the top-15 team rarely moves down. AP writers are biased, and for the most part, stupid.
* No more high school sports on national television. These kids are under enough pressure, without exploiting them to the world.
* Private schools in every state must compete in their own private leagues and state tournaments. Sick of seeing small-town Podunk dominate until making the regional or state tournament, only to be thrashed by a private school that recruits players.
* Instant replay should be used more extensively in all major sports. Too many biased and stupid officials.
That's just a few off the top of my head.