How would that impact you?
1) May turn into a civil war. Not good.
2) North Korea may see a chance to take over. Not good.
3) Other countries may oppose this move. Good? Not good?
4) Russia, China, Iran + may decide to back North Korea. Not good.
5) Many of these countries have nukes. Not good.
6) Remember WWI? Not good.
7) Al Tiftach Peh L'Satan.