I don't think its going to matter all that much if he drops dead, there's no liberalization of North Korea coming as long as that family has control, and the Military is perfectly content for that to continue to happen.
His Sisters, are both equally ruthless and nasty as he is, the only difference is that they will have a softer international appearance.
The problem is that if any of the other factions or Chinese decide to get involved to depose the Kim family, frankly it will cause a major civil war with the possibility of nukes or chemical weapons being used, and a massive refugee humanitarian crisis.
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My name is Ozymandias, King of Kings;
Look on my Works, ye Mighty, and despair!
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