China - the country with most Internet users

According to the BBC announced yesterday, July 28, which quoted the China Internet Network Information Center (CNNIC), China is the country with the most moving Internet users: 253 million. So far the rule was held by the United States with 223 million.
From this point of view, I think competition is practically completed. The 253 million internauts represents 19% of China's population, and those 223 millions are 71% of U.S. residents. Analysys International says China firms with Internet-related businesses reported last year by 5.9 billion USD Venturi. In comparison, the United States have achieved revenues of USD 21.2 billion online advertising only.
I do not know whether Chinese authorities truly want to make an opening in terms of public access to information (given about filtering ads for Google and others), or with the use of such potential digital war. In 2012 total internauts in China is estimated to be 490 million (56%). Some of them will be taking and personal computers. Imagine what immense computing power will sum them (if they are infected by viruses under the control of authorities) and whether any government or economy could withstand a virus attack came from China. The idea above is only a hypothesis, but with the memory fresh attacks on Georgia claimed that Russian coming from some computers, I think it deserves to be considered.
Surely Interentului world will have to solve in the next 2-3 years a number of challenges. I think that the presence of a large number of users will hasten passage of IP addresses from v4 to v6.