Credible reports I’ve seen put the permanent early malnutrition damage to the rising generation at catostrophic for NK.
They will be fielding an army of low-IQ stunted runts. Their national future is damaged beyond comprehension. These are not big relatively fit East Germans, folded into the West. The SKs want nothing to do with caring for millions of damaged NK children/youths post reunification. They want to keep the DMZ wall up now more than ever.
If NK regime collapses and SK take over political and military control of NK, DMZ will still stay, while NK will gradually "grow out of" slow motion massacre inflicted upon them by Kim Jong-il. The lasting legacy of Kim Jong-il. It will haunt Korea for a long time, and serve as a black mark on NK sympathizers. They will remain walking proofs for decades.
They want to keep the DMZ wall up now more than ever.
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Let the wall fall on the other side. This is China’s mess & they ought to clean it up.