The article mentions China and India. You are using unnamed and undefined “emerging economies”. These are 2007 numbers, explain how you reconcile your chart with these numbers.
Rank Country GDP (millions of USD)
— World 53,640,000
— European Union 16,370,000
1 United States 13,790,000
2 Japan 4,346,000
3 Germany 3,259,000
4 China 3,249,000
5 United Kingdom 2,756,000
6 France 2,515,000
7 Italy 2,068,000
8 Spain 1,415,000
9 Canada 1,406,000
10 Russia 1,286,000
11 Brazil 1,269,000
12 India 1,090,000
http://en.wikipedia.org/wiki/List_of_countries_by_GDP_(nominal)
I agree with you. The US is long, long decades away from being supplanted by any other state. But remember, it is possible. It takes a country to only maintain a minor number of able and dedicated engineers, scientists and other professionals to give it a cutting age. In this regard, the US is supreme, bar none. As long as America has the qualities in it to sustain the above, it is more than enough.