According to bitnodes and ethernodes, there are around 150 BTC public nodes and 400 ETH public nodes located in China.
CCP hasn't launched an ISP level blockade yet which is one of the few cards reserved in their hands.
Since BTC has 3000+ nodes in TOR (Can't tell how many ETH nodes in TOR) , I think users in China could still have access to full nodes then.
China has already done this twice I guess and although it dumped the price of bitcoin temporarily bitcoin recovered and proved that it doesn't need the approval of any particular country to be operated. So whether or not bitcoin is banned in China, it will still run as a decentralized network and until the internet itself is completely shut, there's no stopping to bitcoin.
So there's basically nothing to worry about as bitcoin is here to stay.