Why are people talking about "China" as if all Chinese miners live in a flatshare or something? No matter where the miner is from, it is in his interest to keep the bitcoin price stable/high. Miners investing large quantities of money and time into bitcoin-based operations strengthens the ecosystem, not weaken it.
Actually many believes chinese are behind every new pumps bitcoin is seeing right now and as due to devaluation of their currency many speculate chinese are divesting their investment/holding to bitcoin so that they can exchange it for usd easily when needed with nice profit which they can't get holding their own currency. Buy and trading volumes also always remain high in chinese exchangers.
Bitcoin still decentralized as it is, even if 90% transaction in Cny it doesn't matter as long bitcoin price keep pumps.
I think it's a right of every person to mine and trade bitcoin wherever they are, it just matter of strategy.