Well, if your son said “Dad I wanna coach at Kansas someday” you’re better off telling him to try for something more attainable. Like walking on the moon or winning a Nobel Prize. Things like that
Why would you discourage your kid from chasing a dream? Wouldn't it be better to tell him in order to have a shot at coaching at Kansas that he would need to cultivate contacts with runners, agents, and shoe company rep's so as to be able to cheat and pay recruits. You know, like your current coach does.