I don't think anybody wants North Korea. It's been badly mined and exploited. The people have IQs 20 points lower than their southern neighbors from indoctrination since birth. More pressingly the farmland was ruined in a failed terracing project in the 1980s. Intended to increase farmland the terraces instead collapsed and choked the waterways, with enormous loss of topsoil.
China would be smart to "broker" some kind of international reconstruction agreement.
NK does have the last enormous pool of cheap labor in Asia, higher skilled than Myanmar.