Doesn't matter if it's big or small.
Mine:
Baseball - 5 innings and 5 outs per inning. It's a little unconventional, but it would help produce more offense without having to juice up baseballs and shave pitching mounds; it would increase the action in a sport that is lacking in that department; and it would help to decrease to overall length of the games.
Basketball - I'd make a rule where shots behind the perimeter only count as 3 points in the final 4 minutes of each half or something. I'd say just eliminate them altogether, but that might also cut down on some exciting finishes. If you just got rid of them for most of the game, I think teams would learn to play much differently. I can't believe I'm saying this, because all I did was shoot 3s when I played, but it's gotten to a point where it's more than I can take. I think there should be more incentive to get the ball closer to the hoop, and teams that are able to get an open look from 10 feet should be rewarded more than ones that settle for 22-foot looks. I know we're so used to it, but the concept of the 3-pointer is weird anyway. It's not like layups count less than shots from 15 feet away... so why is there a random arc where everything behind it counts for more?
Hockey - No offsides. So easy.
Football - I can think of about 100, but I'm going to heed my own advice and only choose one. This might not affect the game much (though it might shorten some replays), but it's 2020. Why in the world are we still watching various camera angles in trying to determine if a ball crossed the line of gain? You mean they can't chip the ball and add some sort of sensors to the first-down markers (or AT LEAST the goal lines) to determine if/when a ball crossed? Come on.
Mine:
Baseball - 5 innings and 5 outs per inning. It's a little unconventional, but it would help produce more offense without having to juice up baseballs and shave pitching mounds; it would increase the action in a sport that is lacking in that department; and it would help to decrease to overall length of the games.
Basketball - I'd make a rule where shots behind the perimeter only count as 3 points in the final 4 minutes of each half or something. I'd say just eliminate them altogether, but that might also cut down on some exciting finishes. If you just got rid of them for most of the game, I think teams would learn to play much differently. I can't believe I'm saying this, because all I did was shoot 3s when I played, but it's gotten to a point where it's more than I can take. I think there should be more incentive to get the ball closer to the hoop, and teams that are able to get an open look from 10 feet should be rewarded more than ones that settle for 22-foot looks. I know we're so used to it, but the concept of the 3-pointer is weird anyway. It's not like layups count less than shots from 15 feet away... so why is there a random arc where everything behind it counts for more?
Hockey - No offsides. So easy.
Football - I can think of about 100, but I'm going to heed my own advice and only choose one. This might not affect the game much (though it might shorten some replays), but it's 2020. Why in the world are we still watching various camera angles in trying to determine if a ball crossed the line of gain? You mean they can't chip the ball and add some sort of sensors to the first-down markers (or AT LEAST the goal lines) to determine if/when a ball crossed? Come on.