No. It will not happen.
What is happening right now, is that N. Koreans are looking at this chubby short korean kid that is running their country and are losing respect for him.
So in order to bolster his image and make him look tough and decisive, the people that control him (yes he is a puppet), are putting this threatening and bully-type stance against the US - which is who N. Koreans typically see as their enemy.
And for those of you who think S. Korea is our friend, don't be mistaken. The goverment of S. Korea puts up with us in exchange of trade and military perks, but the population itself has disdain for americans. I personally got into heated arguments and was threatened with violence on subways and other public places in Seoul, simply because the locals heard my american accent.
One time i was sitting in a subway talking to a friend and an old man, got up from his seat and stood in from of me yelling in Korean with his finger pointed at me.