I think the official figure for the richest province, Guangdong, officially managed to break over US$10,000 only last year. And add to it only Shanghai, Zhejiang, Beijing, and Fujian are prosperous. These areas comprise about 20% of the populations. All other provinces is about 1/3 or even 1/2 lower than the wealthy areas' levels. This is why I think the $6,300 figure sounds a bit too high.
Also I know some non-politically related people who are starting to feel well off, but they would be considered pretty poor even by Malaysian or Thai standards. Most of the wealth is concentrated in party opfficials and their cronies (dai quans).
Mankind, the World, humanity because of science can now, by and large, feed and meet the basic material needs of people for the first time in history. Furthermore, the scientific, computers, modern agriculture and basic health have only begun to have their effects. The big problem that can ruin this is politics. Communism is false, untrue delusion. It is a lie.
China has given up on the shinning illusion of Communism, kept the worst parts and embraced the energies of capitalism, good and bad. With out open, honest politics, central political control and greed will produce malignant monsters.
Hope for the best.