[smsm42]

I'm not saying they couldn't do it - unlike South Korea, China doesn't care too much for the welfare of the population beyond the basic subsistence level, and has enough resources to avoid outright starvation in NK if they took over. I am saying there's no reason for them to take over, because they now already have all the benefits of control with none of responsibilities of it. It would be literally stupid for them to do it unless they face the imminent danger of either losing control (thus Korean War) or having a hot and possible nuclear war on their borders (thus agreeing to put the leash on Kim, for a suitable price of course).