They are a very disciplined workforce ..... I have read the article in the Fortune magazine a while ago, on how fast they have build Super Nuclear power plants... and that was impressive.
If they do set their minds to it, they would most certainly be able to create a SUPER structure for Bitcoin mining and have a degree of control ... So I for one, would not right off this article as complete FUD.
There is nothing to fear, as I mentioned if anyone has too much power and uses it in an abusive fashion people will simply exit the market.
Remember BTC is firstly a technology, considering the fact that it is an open source technology it obviously can be duplicated. The community
is a totally different story, communities are extremely difficult to create, once hurt or damages if they start to exit it is almost impossible
to win them back without a huge influx of resource.
Ripple is a great example of the same technology in the control of a single entity however the community is comfortable so no problem.
In other word, if China takes over via mining power or majority coins it doesn't matter they are not looking to screw up, nevertheless as I mention earlier I doubt if they want majority interest it simply puts too much weight on them. Whereas being a large minority share holder of any position allows you to complain with force because all you need to do is get with others like you to make things happen if you really want change.