Their ban was powerful, made bitcoin dumped to 3000 usd, but now it is 3700 usd again. They can't prevent the future.
Of course the Bitcoin market will not be collapsed by Chinese people and I'm sure if China disappeared then the cryptoucurrency market will probably be more stable and will have a good future development path.
They don't have all of bitcoins, that's why their ban just temporarily affecting the market, they're now barely have capital more than 20% of total supply, all the money went to many countries with loose rules.
this ban also bring negative and positive affect to china themselves.
by this i'd say, bitcoin is a top notch future currency.
It's more of a group decision that they have in the higher courts. China can't remove the ico's from the people because there's ways around it their laws.