You have to understand that there's a lot of miners not just in China, although they have the bulk of the mining farms there. But lets say all of them stops mining, then in just a couple of days bitcoin price will plummet because this will severely impact investors mindset that bitcoin is already dead.

However, realistically, I don't think that all miners will have a collaborative and coordinated effort to shut down everything. Its business at the end of the day. So it doesn't make sense at a business standpoint to just stop it just even for a day because you are also losing money here not just investors or traders.