I think his question remains unanswered for the most part. Are you implying that the horse of the economy of tomorrow will be engineering, with burger-flippers to serve them and janitors to clean their offices? I don't think we can build on that as a foundation. If you can cite other examples beside that one I'd love to hear it. Even some of the IT engineering is being accomplished from the outside with the likes of software in India etc., and I'm sure that's not the only example. I don't think many want to move there to flip a burger or clean stalls. Imagine the economic class divergence if it did boil down to a tipping of the scale towards almost a all brains driven society. If those brains ever became primarily foreign (what's to stop them gaining superiority over the longer term?), could we possibly keep the trophy as the king of consumers?
I think the real answer is quite frankly: we don't know (right now).