pretty much agree with this poster.
here is the perspective of one of those kids who ran fast at a young age - now 50 - who still runs fast and why I think I never burned out. I will add that I am one of those runners who does not take a break at the end of a season like so many say you must do to avoid burnout. I was also competitive in high school 3rd at state jr year....NAIA college all-American...got pretty decent after college...still a fairly good masters runner. I have run high mileage (last summer ave. about 160 miles per week). I have run low mileage (probably a little as 20 per week much of high school). quality at 40 miles per week = which produced my fastest 8k 23:45 at age 24. and slow jogging. I have trained for and competed in an Ironman race and....marathons (never mastered any of the longer events very well though) best 1/2 ironman 4:25ish - marathon only a 2:35 on all 3 attempts at age 24, 26 and 45.
I ran 5:02 in 8th grade track (no real coaching - no parental oversight or input)
and I am not complaining about either...I think the reason running was always fun and has remained so is because it was always my running (I was not running for someone else - either a coach or a parent. I was not trying to hit their times or goals or expectations. However, I always had my goals.
Ironically, as a masters runner, a few years ago an older brother started giving me too much input and advice and suddenly all the fun and excitement about racing was sucked out - I had to tell him to back off - stop telling me what he thinks I should do, etc. And all the pressure and frustration was lifted and I was back to running. and loving it.
Message to parent: it is not your running/career.
You do not get to set goals and expectations for them - well you can but shouldn't...because nothing will ruin it for them quicker than the day they don't meet your expectations. and the day they walk away from the sport will come shortly thereafter.
You want to kid to reach their full potential - then support them by listening not coaching. ask him what his goals are...or don't even ask - if he has goals he will share them with you if he wants to - if he doesn't want to broadcast his goals don't be offended - sometimes this is a good thing.