|Quoting Pyrex (Reply 8):|
it would be way, way worse than West and East Germany
It is way worse than the difference between West- and East Germany. Not only would they have to deal with a bankrupt economy, they'd also have to deal with the brainwashing that the dictatorship in Pyongyang has performed on its people. It would go beyond infrastructure, liberties and economy, it's simply easier said than done.
The unification of the DDR with Germany was much easier, because West German interests were much better represented in the DDR than ROK interests in the DPRK (both political and economical). Also, there was also lots of transit between the two Germanies and better possibilities for West Germans and citizens of West Berlin to get a weekend visa to visit relatives on the other side of the border, even though we all know the DDR wasn't as generous to its own citizens as it was to those in the West. Part of the reason why they allowed West Germans in was most likely the fact that they brought hard currency into the country (mostly D-Mark and the odd US Dollar) and were forced to exchange it against the rather worthless DDR-Mark. Also, in the DDR, there was a certain degree of intellectual freedom. It's not freedom like we know it, but what I mean is that people were not brainwashed into believing that e.g. Erich Honecker was a God or something. They could think freely but be careful with what they think, because one false move and they're forever under surveillance by the STASI.
In North Korea, things are much more broken than they were in the DDR. For example, there's a huge personal cult surrounding Krazy Kim, that kids get educated into thinking that he's God or something, and those who even try to think freely get summarily executed. All that alone, not just the huge debt and the broken economy, would pose a huge obstacle for re-unification of both Koreas. Unlike the DDR, which heavily relied on hard currency from the West for its survival, the DPRK is so deep into its Juche (self reliance) ideology that, apart from the flights from PEK
and perhaps the once or twice yearly visitors from South Korea, they are pretty much fully isolated.