To respond to "High School Coach" (keep in mind I'm only reiterating some of my main points from a different perspective)
You're spot on with the criticism of overuse of anaerobic training early on. These kids dont have the years of "base" (general fitness from running/playing active sports/living actively as part of the traditional lifestyle) that Africans/other foreigners have. The main focus in the early years of high school and middle school should be on building aerobic base through a "sweet spot" of mileage each season (progressing each season, and "threshold" and strength work.
It isn't all too uncommon (at the world level) for young athletes to have continued success after early anaerobic work. I can recall looking at logs of the best Kenyan training camps for adolescents, and seeing a MINIMUM of 4 sessions of quality on the schedule per week (with at least one of those sessions being anaerobic). The key lies in the balance of all qualities of training. Thats the coaches responsibility (one more reason why it would be great to allow kids to continue working with their high school coaches through the rest of their careers). I completely agree that it will be challenging to see an athlete progress to their potential if they hit the speed work too oftenearly on and lose focus in building their aerobic system. However, with the right balance (and proper long term development from a coach), it can work.
As a high school coach, wouldn't you love the opportunity to continue coaching your athletes through college and beyond to see how far you could take them?
Completely simplified (again, I'm not dumbing down, I'm just trying to make a very easy logical argument)... Take one athlete who goes into a Saratoga/Burnt Hills/Saugus/Woodlands/York/F-M etc.
Athlete + HS coach + HS program = success
Athlete + College coach/program = non-success
The athlete certainly hasn't changed... what HAS changed that would alter the end result of success?
Arguments are welcome... I'm just trying to understand why in this situation EVERYONE seems to place blame on the High School coaches and not the College coaches.
Of course there are TONS of other variables once college life starts that you can't deny. But at the most basic level between coach/athlete relationship (which is whats being discussed here, isnt it?), this is it!