A lot of the old school NA talent just straight up left the realm of CS, though. fRoD, Warden and Rambo tried to mentor the community but they had little success.
When you consider players like shroud, n0thing, sgares, skadoodle, only one of them actually seems like a good mentor for tier 1. shroud hasn't taken CS seriously since he joined cloud9. n0thing is a great role model for the community at large but I don't think he has a lot to offer the top tier NA teams at this point in time. Skadoodle is basically an alien, he doesn't have a mentor mentality.
sgares could probably be a great coach but he's clearly not interested.
I just don't think NA players enjoy being out of the server like so many other nationalities do. The problem lies there.