A plausible theory may be that Jihan and the other pro-big-block pools are planning on switching support to a fork with much larger blocks 8mb+.
Yep, that would centralize even more power in their hands. Do you guys know, that every antminer has a backdoor?
http://www.antbleed.com/
It basically means that Jihan can switch off any miner if he decides to. Either you obey or your $$$ investment is worth nothing.
That's why we have UASF and that's why we're gonna have SegWit. China can have 100% control over their China Bitcoin Cash, but not over the real Bitcoin.
I'm fairly certain that Antbleed was just propaganda. Why? Because that propaganda page was launched anonymously!
https://pastebin.com/jREuwQ8b
Someone didn't want his miner to be switched off... But who knows for sure, probably Jihan himself only. Yet it's hard to argue that his antminers have majority in the Bitcoin hashrate.
The same BS was also used to sell the ASICboost as some kind of undisputed fact, when in fact there is no hard evidence that Bitmain has ever used the covert form on the Bitcoin mainnet. Zero empirical evidence!