It's already gone, dude, or do you consider three to five times the wage to be still having the advantage in wage?
China is a huge market it self, we have the infrastructure, we can produce every part of a product, we have experienced managers, established reputations, large amount of capital and more.
High wage is relative, it's still far lower than in the US, but it's far higher than the other developing countries.
Will we hit a wall? Yes, but that day is not here.
One of the interesting things people do with China is you magnify China's problems, and forever fail to mention the fatal flaws that kept the others from out performing us.
We are not perfect and we got tons of problems, but once you see how much worse it is for the countries you think can "replace" us, you might be sing a different tone. Then again, I been Chang-ed before.