Not if the rest of the world blacklists their chain
If the rest of the world tries to blacklist the longer Chinese chain after remerge, I'm sure the Chinese miners (who own >51% power) will fight back with a 51% attack to the shorter "main chain".
Epic times ahead then
If they use their 51+% to attack Bitcoin they will have few hash power left for their chinese fork
Miners from the rest of the world could then attack the chinese fork