Who cares? We know that a lot of Chinese migrated their operations on other countries where mining is legal. And if that is true then it could be that before 2021, China has already made up their minds that they need to be in this industry because btc possibly before that is successfully adapted in many countries.
What happened after they banned exchanges Binance moved to Malta still it is one of the biggest exchange in the world . Its making lots of progress even still more . If mining reduces in china coins value increase in other place . Because if there is a less mining there will be less supply .