The problem is not Kim’s ongoing actions. If he stops those actions he still has and is further developing nukes which he will use one way or another to “unify” Korea and punish his perceived enemies. Kim and his present arms have to be neutralized very soon whether he starts being a nice guy or keeps raging.
People who think the North Korean KPA will go through the ROK Army like a knife through butter have never spent any time with the South Koreans. I lived and worked with them for two years and heard their Vietnam war stories, so I know better. The ROKA is one of the best in the world, on par with our Marine Corps or elite Army divisions. ISIS should be glad we’re not using them in the Middle East.