It seems to me that China will in no way give up mining. Since they stood at the origins of cryptocurrency and it all essentially began with. I do not think that they will give up their own money.
It says that they planning to end it on 2021 so I believe by now they are already planning and preparing for something better to replace what they have right now in mining. Theyre probably planning for a more advance devices in replacement to what they are using right now.