Fascinating isn't it .... for the most talented people at least, this looks the development of a truly global economy when someone who has X,Y and Z skills in Bangalore, Shanghai, London or New York will get paid the same no matter where they live.

Probably this effect will get less and less as you move down the economic ladder. The middle class and people without skills in different countries will continue to earn different salaries simply because they live in one country or another.