recently about the pedigree of Animal Kingdom were used to emphasize how the American breeding industry perhaps needs an influx of fresh blood to emphasize more distance, rather than speed. While I agree in some respects with that thought, I also think it's a bigger reflection on how horses are trained rather than pedigrees why we lack quality going long. I'll use Distorted Humor as an example. Here's a horse that if memory serves me correct, never ran a step past a mile, yet he's sired some of the better horses that have gone long over the last 6-8 years. I doubt if anyone would have thought he'd be so productive a sire after watching his career but his offspring clearly have done so. (His progeny include Flower Alley, Funny Cide, Drosselmeyer).
I just think if the emphasis was shifted from pushing young horses to go fast early to fetch a price at sales and stamp sires as "good" win early prospects that horse would indeed begin to flourish for longer periods of time and possibly result in less catastrophic injuries so early in their careers.