I think if anything, it will be small conflicts. China is content with industrializing their nation, they still have much more growing room. They are going through what the US went through during the industrial revolution. Majority of China's population are still "peasants". North Korea can be summed up as Soviet Russia in the cold war, isolationist, flexes her muscles but knows better not to stir the pot. I doubt that there is any country in the world that wants to start anything with a NATO country, much less the US, results would be way to devastating. Iran most likely doesn't want to start anything, I think they learned from the Gulf War that it's way to risky. As far as Pakistan, they are too busy with India, also with US presence already in the region, they're going to behave themselves. Keep in mind that Nuclear weapons are meant for use as a deterrent, not as an opening strike weapon, as everyone should know if a nuke was used as a starting blow, it would be all over quickly for the aggressor and possibly the entire planet.