Idea for baseball...

7-inning games...

1) Games take too long. Well, multiply by 7/9ths to get 2:45 instead of 3:30.
2) Stats are juiced. Well, 73 homers times 7/9 is 57. Even Barry can't reach Maris now.
3) Pitch counts. Suddenly 105 pitches gets you a complete game.
4) Bad middle relief. Now you just need two closers and a starting staff.
5) No doubleheaders....well, I'm not sure this helps, because of the whole "separate gate" issue.