Maybe they will replace bitcoin mining to mining something else in the future.
We don't know if bitcoin still on the top of cryptocurrency or no in 2021, maybe something new will born in near future.
I think they want to stop mining cryptocurrency and if they want to mine the other coins, I think it's not worth mining the other coins since bitcoin has the higher price depends on the other coins. So I think if they want to shut down the mining process, they can do that in anytime and I guess that there is no problem with the other country because they could continue to mining bitcoin and other coins.
they just want to ban it in future, but that could be absolutely temporary decision.