I agree that China has no effect in the long run, because it's quite expected that the government that bans Google and Facebook and tons of other services will be against Bitcoin. But it's really hard to predict their impact in short term, right now the price almost rebounded to the previous level before news from China, so it's possible that Bitcoin's price will just ignore China, but on the other hand we had a huge crash in 2014 and a long bear market without any real good reason - so if China will for example ban mining, Bitcoin might again enter bear market for a long time. But the price is only one aspect of Bitcoin, and the network itself can't be affected by any laws and regulations, so it will continue working as usual and developers will continue making improvements.
Right! They did that, too. But Google still exists, doesn't it? How about Facebook
Usually they rebuilt something more localized like Baidu. Makes sense if westerners cannot really do mandarin. But Google has returned to china, hasn't it? Featuring a local subsidiary now and struggling on third place by market share.
One could suspect there will be a state run crypto currency popping up that will play the same game again. And then there will be gateways between that state controlled artificial currency and Bitcoin, which will be hard to do but completely disrupt the govermental banning approach.