A ban in crypto mining in China will give more problems towards Bitcoin other than a price fall for it. We are talking about more than 60% of Bitcoin's hashrate suddenly disappearing temporarily and this will cause a lot of problems with Bitcoin's blockchain network resulting to unconfirmed transactions and higher fees just to complete one. Asking if a ban will realistically happen I can say that it has a small possibility to do so because for one if this is all about Inner Mongolia's decision to ban mining I don't think this decision will spread out to the other regions of China.