It seems you do not understand what mining is and what its purpose is. Any time someone in the world buys or sells or transfers BTC, it requires a hash and tying two ends of a chain of data together and then replicating that across a large number of other chains. Currently, about 400,000 of those a day occur. Note also that it takes approximately 10 minutes for each transaction to be validated and then some variable amount of time for the information to reach both sides of the transaction.

This is what mining is.

Therefore, if China chose to remove 67% (and possibly more) of mining capacity, then the queue of 400,000 a day (4.62/second) reduces in best case by 2/3, but likely way more. This will begin a process of extending longer and longer queues of transactions and slowly bring the whole thing to a near standstill. It is (pardon) laughable that the lost 67% mining capacity exists anywhere else. As this situation persists, the queues will grow longer and the system will enter an unknown state: no buying or selling, no wallet-to-wallet transactions for a lengthening and indeterminate period, and, possibly effective shutdown.

The idea of making rapid changes or any changes at all, for that matter, is what led to the fork. And that happened under much more favorable conditions of the infrastructure at the time.

And, for good measure, you can add to this the additional problems that would be caused by the Chinese government flooding sells of all the BTC held after the October 2017 change of law in China.

This may be way over your head and many others. In this sense, crypto has some resemblance to real investing. You still have to have some idea of how the sausage is made or you’ll end in very, very sorry.

Like all “revolutionary” ideas, they are divided in two kinds. Those that require ignorant zealots and those that are lasting and truly revolutionary.