I think you are VERY wrong.
We're NOT going into Korea next, in fact I expect a withdrawal from the DMZ and a departure of at least some of our troops in this calendar year.
The IAEA has turned the matter of NK's withdrawal from the NPT over to the UN SC to deal with. That makes me smile.
It's clear that the SC wants the US to be stuck to this tarbaby and doesn't want to get involved.
For the first time in a long time though, the US is staying one step ahead. If ANYTHING is going to get done, the UN SC is actually going to have to take a leadership role in this one.
Won't happen.
So, from my point of view (isolationist) things are working perfectly.
The US will be bringing its troops home out of Korea. That's pretty much what Rumsfeld just said at the Pentagon "town meeting".
The South Koreans that have been demonstrating to get US troops out will get their wish.
The NK's won't be blackmailing us for any more food or treasure.
All sounds pretty good to me.
And if the NK's start selling nuke technology and weapons around the world...well, that's not bad and it's their right to do so, correct? Because if it were bad, the UN SC would do something, correct? That's what they're there for.

After all, we'll have Blitz to remind us that
"North Korea is in no way a threat to the world, it's simply ridiculous."