The only way unification can ever happen will be with Chinese blessing, with or without democracy. That would mean a full exit of US forces from the peninsula, and substantial pandering to the CCP and influence in Seoul. Which isn't that far off a thought honestly - for the most part, Korea was a tributary of China. With rapidly changing demographics and economic heft in both countries, it's even more likely SK will gravitate towards China, to the point that the Chinese will find more persuasion in unification and predictability.
All probably close to correct. I wasn't arguing that unification would, or should, happen (especially by force). I was arguing that the strategic value to China, SK, the west, etc have flipped as well as the actual capabilities of NK are likely vastly overstated.