I really think there is a chance that NK leadership has gone so bonkers they would actually try something like bombing SK. I doubt it would be effective unless they bring a nuke to the fight, but we're still talking about one of China's maybe-buddies. The USSR was scary, but they weren't so honking insane as these guys.
Hopefully, NK will just keep doing the "chest thumping" thing until they get tired. Or it's all just a bluff in the first place. I, personally, have had enough wars/actions/what-have-you for now. Too much death. Everyone (including the US) just chill and have a cup o' tea and a biscuit.