I think the US is getting to the point where we've got soccer players and can afford to moving away from the scripted style of play to that of the free flowing style we're beginning to see now. Unlike basketball and football the game can't be drawn up on a chalk board and cannot be dictated or drawn up ahead of times. There's a rhythm to it that we've never been able to find in the past which is IMO why we've always struggled to find success in the attacking 3rd, while generally being disciplined enough in the back to be competitive.
It's the constant chess match where your opponent presents a problem and your players are forced to find a solution on the fly. The intangibles of street soccer play into that model perfectly, as at an early age these foreign players are tasked with adapting to not traditional balls (patched balls, or in some cases makeshift balls), playing surfaces, lack of rules, or the fact they're just playing what we'd consider an unorganized playground game. Our kids don't learn from the streets and don't have the opportunity to figure things out on their own or teach themselves.