Since it seemed to be mainly coaches taking a bribe, I think it will be very hard going forward to scam a sport. I do not know how much you can stop someone for taking the SAT for you. Although maybe they will check IDs better.
I thought that colleges were tracking outcomes from schools. So if a kids with 4.0s from certain schools do more poorly than 4.0 students from another high school, they bell the grades lower. I also notice on college confidential that they don't seem to rate debate well since so many kids that don't get in with great scores and debate club president are deferred or rejected. I think there are too many with debate on their CV so it gets rated lower. While sailing is less prevalent and gets a higher admission rate. But with sailing you have to a have an online profile in the sailing community and race scores so it is impossible to cheat on official sites.