The whole Axis of Evil thing was always a bit much (drawing a loop around three countries that aren't even really on speaking terms), but there has always been a lot of "NK= Scary!" and "untouchable because China=Scary!" in the public consciousness. So much has come out in recent years that just make North Korea look sad and pathetic and not worth any fear at all any more. China's semi official "Pfft, those guys? *"crazy" gesture*" was the last straw.
Ok, they still have nukes. Seems they'll be drinking the kerosine for them soon enough though. The hard part will be what to do with a dying country with so many true believers. A popular uprising makes things so much more straightforward, or seems to.
Jong-un will probably end up on the run from his own generals anyway. Perhaps he tried to shoot himself.