No question they are a wild card. But what would happen once N Korea starts to economically implode?
Will S Korea seize the opportunity and invade?
Or will the N Korean population revolt and throw the country into a power struggle?
Those nukes are of no use against an internal revolution
If I were the North Korean leadership, once Jong-Il dies, I'd cut my losses, open the country and flee to China. And pray.
I highly doubt they will do that. Ideologues tend to not be all that rational.
Just as when Castro finally kicks the proverbial bucket? His bro RAOUL...will keep the grip.