You are worrying too much buddy. If China does go through with the ban, the mining companies like Bitmain etc won't just shut shop, but would relocate to other countries where they can continue their operations smoothly in a legal manner.
At present, large companies in China had transferred to countries with post-cold conditions along with lower electricity prices when China began drafting the ban. If China issues ban, that will not affect the Hashrate Bitcoin because all the big companies in this country like Bitman have plans to deal with this when this happens.