Is your thinking that the miners will change their position based on their concern about losing the core developers? The miners seem like pretty independent and strong business personalities to me but maybe they have a more long term affinity for well laid crypto theory than I thought.
And suggesting POW change to them reminds me of how well our negotiations with N Korea are currently going.
If the miners stay together the exchanges are probably likely to stay because they need volume stability for their trades. (I would imagine).
Apart from the politicised miners like Jihan Wu, the rest of the Chinese miners are a bunch of thick whores who'll mine anything if it makes more money. I doubt most of them could identify a Core developer if one of them sat on their face.
The only thing miners respect is money. The money is now outside of China. If the money is sensible it's not going to put up with a chain split.