NFL: Move kickoffs back to where they were two years ago because if there is going to be so many touchbacks they might as well not even have kickoffs. Have common sense personal fowls and not every time somebody can't violate the laws of physics and stop their momentum, and not have a penalty every time somebody breathes on the QB wrong. Allow contact up to the point the ball is released on a throw. Realize that concussions are always going to be a possibility, that players, owners, coaches, fans, and everybody else in the country not only should already know that by common sense but has to except that and not chance the nature of the game drastically to try and prevent that. Stop making pretty much every rule change favor the offense like has been done for the past 40 years. Make all contracts guaranteed, make all bonuses simpler, and stop will all the nonsensical bonus and years on the end of the contract that both parties know will never come to pass.
MLB: Make a salary cap and a salary floor. Create very extensive and mostly complete revenue sharing involving anything that a club makes a major amount of money with. That is just as important as getting a salary cap/floor. Get rid of the DH. Get rid off the stupid interleague play nobody gives a rats ass about (other than the World Series). Make a balanced schedule like MLB used to have. Either get rid of the All-Star game or make it so it's taken seriously as a game like it was in the 40s and 50s. That means instead of determining who gets home field advantage which hasn't solved anything it would be played like any two teams in a normal game that try to win. That would mean no team gets at least one automatic selection. That would mean that if somebody is one of the best in the league they will probably play the entire game and not an inning or two. Nobody gets cycled in to pander to a players or their fans feelings if somebody is better than them. The only exception would be pitchers because of the rest they need and the greater chance they can get hurt for some team that isn't their normal one. Get rid of commercials after every inning. With the exceptions for normal stoppages force pitchers to pitch the ball once every ten seconds. Also count every time other than the first a pitcher tries to pick off a runner and fails as a ball against them.
Boxing: Get rid off all the associates and have one league or don't bother to exist as a sport. Make judging a lot more objectively based or make it so their is no such thing as winning by decision. Make a ranking system where once or twice a year the person a rank below somebody can demand a fight with the person above them. No more having somebody dodge fighting somebody for years. Get rid of many of the weight divisions. There will only be three, light weight, middle weight, and heavy weight.
NASCAR: Get rid of the Car of Tomorrow. Make it so the cars are actually different for each manufacturer instead of being basically almost the exact same car with a slightly different shaped nose and different decals faking for headlights and grills. Make it so they more closely resemble the production cars they only pretend to be, and make it so a manufacture has to produce at least 10,000 cars a year that are vastly more similar to what is raced that what they have now. Either that or chance the name to NACAR and stop pretending.
NHL: Make the goalies go back to wearing equipment (other than modern day helmets) that were the size they wore in the 70s.
Once thing people are mentioning that I don't get is why so many people want a certain amount of time after high school before somebody can become a professional. The NCAA already has an exploitive virtual monopolistic cartel that drains money away from their players under the guise of amateurism and some people want to help them out on that even more.
Actually since the NCAA is pretty much a de facto major sport in basketball and football I will go for this
NCAA men’s' football and basketball: All top division colleges have to have revenue sharing, and a salary cap/floor for men's football and basketball. All players will be considered employees of the college (or just students if they can get rid of some of the sillier aspects of Title IX) and are allowed to sign contracts and be able to be paid whatever the NCAA team wants to give them under salary cap (including scholarships as part of that if that's what the player wants) and revenue sharing restrictions. If a NCAA entity doesn't want to do that and they really truly want to be amateur they are only allowed to bring in a small fraction of what they big schools do now in money, they get to make no television deals, and their is a cap on what coaching staffs can make that is only a small fraction of what it is now.
MMA: Get rid of wins by decision. Have only three weight divisions like the boxing example above. Get rid of some of the dumber rules that have come about like the 12 to 6 elbow rules among many many others that have popped up in the last decade. Eliminate or extend the length of rounds and let grapplers work their grapples like in the past. Allow a person to get kicked if he intentionally goes down to a knee or more or at least find a way of punishing those people more.
Formula 1: Get rid of all restrictions on cars except: A car's total volume must fall equal or fall beneath a certain amount. A car must be safe enough it doesn't hurt anybody in the crown and must be safe enough that it doesn't significantly increase the risk of hurting another driver on the track (like blowing up in a huge explosion). Other than that let them do what they want to make their cars fast and create innovations.
Soccer: Without changing enough things where it wouldn't be soccer anymore, but some significant offshoot of it, the sport is just beyond all hope of being something worthwhile.
