By the time airpower does arrive to destroy the artillery would Seoul be a heap of rubble due to the reign of artillery shells? Read my post number 84
That seems like an uncertain thing. Statistically, I would be surprised if the North had more than a half hour of free shots at Seoul before they started taking heavy losses. And the North can't replace men and material like the North and her allies can. But with Seoul, that's the down side to it being so close to the border.
There would surely be heavy damage, but the Koreans are very tough resiliant people. The Japanese treid to conquer them for hundreds of years and never did until WWII. With all the advanced listening posts we have there, and covert agents we are certain to have in North Korea, I wouldn't rule out the possibility that we would know about a first strike attack before it happend. I think that is being overlooked here also. The South Koreans have been sending over spies to the north for decades. So have the south, but the edge in that competition goes to the South. And our superior air power is a huge asset if the North launches a first strike. Night fighting tech makes our planes even better than in the day time, and so we could start picking off the North's platforms at will, and it would be very difficult for them to move, or defend themselves. If the North was stupid enough to launch a first strike they better get their shots in early, because I wouldn't give a cup of warm spit for their chances of having any kind of half way decent offensive artillery, armored, or air force after three to five days of fighting with us, IF we're only going in against the North Koreans. If the Chinese decide to jump in, well. That's a whole different can of ugly.