I think China already have their own coins just like other countries. And I'm positive that those coins are decentralized which means they have control over it. So if you are asking if they still need BTC then my answer is yes. Well, their citizens do and I'm pretty sure some of them really have btc in their stash. Who could resist owning btc right now, right? China is all about having control so of course there will be people there who is tired of being manipulated and maybe that's the reason why there are China town all over the world. Citizens choosing to live far away from their homeland as much as possible.