The problem being, of course, that it takes kids a long time to develop those skills, as seen not just from my comments but some of the other ones.
A few things...first of all we are talking about kids here that are learning to play the game. Is it more important for them to win or to learn how to play properly when they are young? I'd argue in the younger stages it's more important for them to learn how to play. US Soccer's latest guidelines (none of which are being listened to) is that scoring and winning should be deemphasized in the younger stages. The guidelines are being widely ignored because that's not what the parents are looking for...they are looking for the wins.
But separate from that is the question of whether US Soccer should be developing a better possession based game. A lot of this stems from the success of the Spanish and Brazilian teams. And the record in the Champions Cup and World Cup seems to be that possession based teams will usually defeat more direct oriented teams (Exhibit A: the English). But that possession takes a long time to develop, is vulnerable to mistakes, and until possession is mastered the direct method can often defeat possession based soccer.
Then, even internationally, there's a split in what soccer should be. In most of the world it's a beautiful game that is largely mistakes oriented...the winning team isn't always the most athletic but the one that can move the ball well while making the fewest mistakes...it's a negative game (like tic-tac-toe) in which the score should be 0-0 unless one or the other side makes a mistake. In the US and England, it's (like basketball or American football) been viewed more as a positive game...not about avoiding mistakes but about making the score.
I'm not weighing in on which is a better approach. As other have mentioned as well, you can have winning teams with the direct approach, whether in college or internationally. But the powers-that-be have decided we don't want that...so short of changing their mind, possession soccer remains the ideal.