Just thinking out loud, all call it daydreaming...But, what if he's dead and there's a large internal power struggle over his successor, and China gets involved...and they, by some act of miracle, allow South Korea to absorb the North and reunify the country. Wouldn't that be a huge gift to the world? Again, I know I'm dreaming, but it would be nice if it could possibly happen.
Not a chance of that happening. If they do intercede, it'll be to ensure the installation of a successor who'll keep North Korea as an effective satellite state to China, while avoiding the batshittery that Kim Jong-un tended to get up to.