There is a news that Chinese Exchanges Executives can't leave China...
So i don't think it is a good idea to try to have Bitcoin in China. And they will also try to block bitcoin transaction and mining after the 30th September.
https://news.bitcoin.com/60984-2/Some people may still be able to go to Hong Kong. But inside China it will be very risky. And how can they get fiat money? Bitcoin will be useless for them if they can't exchange it with fiat.
It will only be useful if they leave China. I hope it is only temporary, but we don't know.
Only some rich Chineses are going to be able to leave China just to trade Bitcoin.
If they don't have a lot of Bitcoin, it is not profitable to trade Bitcoin. As they will have extra cost just for leaving China.