Which Country will be the Richest in 30 years?

A lot of people are guessing that China will overtake the USA as the richest country in the world in terms of being the world’s largest economy. Do you think this will happen? Will it be good for the world? Why or why not?
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 I think China is going to be the top country maybe before 30 years. I think the more important factor in China developement is it's ppl.that ppl converted their country in less than 60 years to a huge building that give everything to all the world.

Greeting to all CHINESE

I suggust  you who think China will be the richest should come to China if possible. Seek truth from facts. There is no doubt that China develops rapidly. But as a developing country,China has a long way to go. So please don't put it into a position it should not to be.  Forgive my poor english ,Thx

I think China will become the world riches country in the near future.

anan zhang and Mr.Kit, I'm sorry for not having visited China and haven't looked how Chinese people live by myself.

However, considering the international environment where China lies, I think Chinese development is stable.There are no countries which threaten Chinese security and there are many partner countries. Trade between China and Japan(or US) is strongly being promoted, for example.

 I know (by newspaper and magazines) that China has many problems inside it's society. But those problems are like what Japan has experienced. Japan developed to world second  largest economy in good relation to US and Asian countries. As japan could overcome many problems, I'm sure China can do it.(But Japan is now suffering long distraction….)

There will be more than one powerful country:

The USA

The European Union 

Russia

Brazil 

China

India