This is what North Korea says. They certainly have a lot of artillery aimed at Seoul. If we did attack it would have to be a very coordinated attack. It might also require a lot of intelligence work to neutralize the nuclear threat. Nonetheless, artillery can be destroyed and nuclear weapons can be targeted.
I guess the questions we have to be asking ourselves is: 1) Is this situation going to get any better in the future? 2) Is North Korea going to be in a better strategic position in the future? If the answers are no and yes (which I think they are, because Mr. Ronery will then be a psychopath with *working* ICBMs), then we had definitely better consider some sort of regime change.
I'm not sure about #1. There is a race for which will happen first, NK getting a working NUCLEAR ICBM force or the regime sipmly imploding and Kim hanging from a (non-working) lamp post.
I don't know which will occur. But the people of Korea are close to the end, and with good strong sanctions, if put in place now, we'd see them to their last grain of rice shortly. Will they then turn their guns on us or their masters?
How 'bout we simply ask them? "Come into the light, people of NK! We'll feed you, soon as Kim and his cronies are greasy spots!"