Re: korean unification
let's take a look at the cons shall we?
Forget foreign influences--even at the base level, the domestic policy of each of the respective nation bars the two countries from ever uniting. You said it yourself: "Who would give up power." The answer is neither, and it is safe to assume that neither will be the same answer for a long time to come.
Now, assuming that reunification were to happen, there would be a number of overwhelming consequences that would envelop South Korea. South Korea, being the more developed of the two, would experience a flood a refugees from the North. This will result in an overcrowding of SKorean cities, with unemployment and homelessness skyrocketing. Now, there have been some effects historically attributed to these two developments--the most significant of which is crime. Should the koreas unite, Skorea will face a alarming growth in crime. Violence, prostitution, kidnapping etc. will become prevelant.
Focusing on the national level, we see that the united korea will have a severe problem with infrastructure. At the moment, NKorea has really no political system to properly govern the nation. Should the countries unite, SKorea will have to spearhead an entire operation to rebuild the north politically. This will take a very very long time. However, the recontruction is not limited to mere politics. There is always the economy to think about. South Korea will have to try to "jumpstart" the Nkorean economy, which at this point, has gone to shit. Doing this is a long process involving a lot of investment and money. The money used will have no short-term return, thus endangering the South Korean economy as well, resulting in a number of economic problems in the South.
All these will inevitably lead to a break down in the Skorean population's faith in reunificatoin. Riots will increase, a growth in violence will ensue, and then the new government will have another problem on their hands.
Should the united Korea find a way through this chaos, all blessings to their new country. But at this point, it's not going to be a process involving small steps--it's a goal that needs a miracle. Or several of them.
ni pour ni contre; ça m'est égal
"The weight of this sad time we must obey,/ Speak what we feel, not what we ought to say./ The oldest hath borne most; we that are young/ Shall never see so much, nor live so long."
King Lear (V.3.300-304)