Arthur Lydiard — New Zealander Athlete born on July 06, 1917, died on December 11, 2004

Arthur Leslie Lydiard ONZ OBE was a New Zealand runner and athletics coach. He has been lauded as one of the outstanding athletics coaches of all time and is credited with popularizing the sport of running and making it commonplace across the sporting world. His training methods are based on a strong endurance base and periodisation... (wikipedia)

No one will burn out doing aerobic running. It is too much anaerobic running, which the American scholastic athletic system tends to put young athletes through, that burns them out.
If you want to be a successful runner, you have to consider everything. It's no good just thinking about endurance and not to develop fine speed.
It's just a matter of understanding what's necessary and discipline yourself to do it.
Encourage kids to enjoy running and play in athletics. Don't force them to run too much competition.