If it is found that every player gets 4 years of playing in the NCAA, what keeps pros from coming back after their career is over? Since NCAA athletes are no longer amateurs seems like LeBron would have 4 years left. Could you imagine football players coming back after 3-5 years in the NFL and competing against 18 year olds. This is getting beyond crazy. With NIL why not go back and earn another million or so a year.