It seems to me that you're defending the uppermost social class in the US, and are attempting to place blame on the middle class of the US for not being able to compete on the global stage against the lower classes of third world nations. They aren't necessarily more productive, they're just willing to work for less. A lot less. I may be misunderstanding your entire point, though.
> So in order to maintain the globally-superior wages we have become accustomed to, we must maintain and even increase our productivity edge. How do we do that?
Couldn't we do this by having competitive taxes on the highest income workers, and then reinvesting that money into things like: reducing the cost of education, reducing the cost of healthcare, improving mass transit and infrastructure, and other things that in general detract from the middle class's ability to "increase our productivity edge". This seems like at least a step in the right direction, instead of allowing the upper echelons of society to vacuum up and hoard billions of dollars that aren't serving any higher goals other than making a select few wealthy beyond reason.