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.
Maybe, it seems that they still hyping this issue and with what the statement above you, there's possibilities that they will not give it up since they are beneficiaries of this industry, China knows how things works and how they can take the advantages among nations who also wanted to play from this industry.
China won't be letting this to happen cause they know already that there is a huge money in here. There previous statement regarding banning crypto have ended already and they are now with crypto again.
Yes, they could benefit a lots and everyone who are in crypto does. And so there is no reason why they'll keep banning crypto at all.