And how about the Germans after WWII? It took seven years for the US forces to get rid of the Nazi sympathizers who were committing acts of guerrilla warfare them. Plus the country had been obliterated by the bombing during the war.
N.Korea has nothing to build upon...most everything would have to be taken down first and a whole new infrastructure built throughout the nation. And who has the cash to do that? Especially with the worlds economic slide currently.
Corporations who have wanted to set up there simply cannot for the infrastructure cannot come close to accomodating them. The frustration of companies who have tried is beyond believable.....it’s just not there..... Let alone accomodating workers, who would surely have to be brought in to do the work..... Though S. Koreans might be willing they’d have to draw from other nations as well just for the sheer number of workers it would require.