Re: "just gabbing on until..Norks have the ability to nuke the whole US and..free to invade SK.
"They've probably got much more artillery, and better defensive terrain (if they choose not to attack), but a much less modern airforce."
Much less modern airforce, indeed. In that particular respect, given SK, Japanese, and US airpower and air defenses in the region, it'd be like the Spanish Armada coming to invade an England defended by Jellicoe's Grand Fleet.
But on the whole, I sometimes wonder if the anti-Nork alliance is awaiting production-ready anti-artillery defenses before really pushing back on Kim, hoping to get it up and rolled out before the nuclear ICBM threat starts approaching credible levels?