China banning ICO's is one thing. China banning cryptoexchanges that allow the Chinese people to buy crypto in exchange for yuan is a lot more important. If 15% of the world population has no access to buy crypto, it has to slow down or even halt the increase in price.

About your mining question, If it's not absolutely necessary, I would not sell a single coin for the next few years. Its value will grow tenfold within a few years (with corrections along the way, which are not to be worried about)