It is rather good for Bitcoin, if a lot of people in China have some bitcoins, it means they want to try to bring it mainstream which we all want such a thing, the price will go higher and higher and Chinese will be rich, but I don't care about that. I dont think they will destroy bitcoin the most beautiful project in the internet for me. I only hope in a higher usage of bitcoin of many many online e commerce sites as this would be the greatest victory for bitcoin.
China, USA or even Zimbabwe having the largest share of hash power does not concern me at all, what it should concern us all is how they intend to promote bitcoin in higher usability which will benefit us all in the end.