It doesn't matter if the china exchanges are against it or some other entitiy. it's all about nodes. if the people follow the fork, chinese exchanges have to follow.
What you don't get is that the major Chinese exchanges are very tightly tied to major Chinese mining operations and those nodes *matter* (as the majority or at least close to it of all Bitcoin hashpower is in China).
but but but majority of Chinese exchanges have fake volume, with organized pump and dump
. It's beyond me to understand how people can trust any of these " major" Chinese exchanges . All it takes for them to crumble/disappear overnight with your bitcoin is a little bit of government crack down........ aaaaannnnnnnd its gone 
then you would see people start crying and complaining about their stolen coins 
IMO all these " major" Chinese exchanges are operating in grey area of law in China hence very susceptible to shutdown at any moment law changes or a ban comes to effect
As for Chinese mega-farms miner, they're simply greedy and are init to purely profit from it by dumping their mined coins every day. All they're are after is fiat money, they don't really give a fuck about bitcoin since it has ZERO utility in China.
Plus majority of mega-farm are located in very remote locations so obviously getting a proper internet connection would really hurt their profit margin hence if they could have their way, they would never want to upgrade at all. It's like asking a kid to give up it's candy voluntarily