Yea I can't see a power like China controlling bitcoin to be a good thing. I also can't see myself maintaining a substantial fraction of my wealth in a unit of value subject to the whim of a totalitarian government.
It's not inconceivable (to me at least) that leaders could decide it's personally beneficial to them (or politically beneficial) to damage Bitcoin, even if it cost a ton of their tax payers money.
No power controlling Bitcoin is a good thing (at least for Bitcoin). That's true for China, who could force its miners to do what it wants, as it is for the US, which could make it arbitrarily hard to transact or hold BTC (and which also has the habit if imposing sanctions on other states' entities).
It's not inconceivable (to me at least) that leaders could decide it's personally beneficial to them (or politically beneficial) to damage Bitcoin, even if it cost a ton of their tax payers money.