I feel that if anytime now would be good to force North Korea into a transitional government and slowly re-assimilate both the North and South Koreans together. This would be a slow and possibly painful process, I understand that. But could that be a potential benefit to both North and South Korea?
South Korea is becoming more of an economic power and North Korea could offer more natural resources and labor which the South Koreans might not necessarily have. From the North Korean perspective, they could gain the rights they've been lacking for the past 60 years or so. Both nations could coexist or at least have a somewhat symbiotic relationship.
Right now for America at least, it doesn't seem like it is the top of the priorities as the new leader of North Korea is most likely going to lay fairly low for a while and our interests are invested mainly in the middle east. But "Korea" could be a powerful ally if it were to present itself as a unified state.