I'm late to this thread but this post is spot on. Let me elaborate.
We're Americans. We like "winning." In youth soccer, majority of clubs are run by fees paid by parents. They want to win so the coach puts it kids that are early developers and they just boot the ball down field. Development is stunted because of this.
As for MLS, the status quo is achieved by overpaying foreign imports and average college players. MLS teams still don't see selling players to bigger leagues as a viable revenue stream. The lack of quality youth coaches is potentially the biggest problem in this. Also, teams don't have a plan to develop a homegrown player. Wil Trapp, Luis Gil, DeAndre Yedlin are exceptions. Most youth players languish in obscurity because the teams are too stupid to loan them or get them the precious game experience they need.
Lastly, US Soccer is equally as guilty in this. Take Tab Ramos for example. He's the Under-20 natl team coach. How did he get this job? He's an ex-player who knows the right people. His coaching resume prior to U20 was pathetic. He beat up on bad NJ high school teams. When the US played Spain in the U20 WC, he tried to play a 4-3-3 with two DM's as center backs and man marking on Gerard Deloufeu (Barelona-Everton loan) and Jese Rodriguez (RM stud). US got smoked, the tactics were laughable.
If you want to learn more about youth soccer and those trying to change it, read howsyourtouch.wordpress.com and follow Gary Kleiban on twitter (@3four3). One of his players, Ben Lederman, left his youth team...because he got accepted into Barcelon'a La Masia academy.
-end rant-