China is at least rational. They would probably agree to withdraw or allow South Korea joint administration of the North, in exchange for US troops leaving the Peninsula.
If NK becomes viable, it could become a market for the cheap stuff China makes.
I agree, and this is potentially what Trump offered China. Stabilize the region, show you’ll work with us, allow SK joint admin or at least access, and we withdraw to Japan. Only problem will be that an iron curtain style rush will occur when NKans find out about SK wealth.
I believe the whole reason China tolerates the Norks is that they are communist and in between them and US troops. Which is to say it’s a lot easier for all concerned to care less: the NORKs serve a purpose to the. ChiComs without being vital.
I’m guessing that if they do anything it will be to either rope in Kim or replace him with communist junta more agreeable to the purposes of the junta in Beijing.