I hear this all the time and I don't believe it. We can do "Shock and Awe II" the length of the DMZ and shove all those "missiles" and arty back up Kimmy's butt before he gets off the second salvo. We can do it if we have a man in the White House instead of an epicene faggot, that is. Frankly, we're good till 01/09. After that... .
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You should believe it. Any GI on the peninsula can tell you the same, it's part of the 'welcome to USFK' talk.
The commies have had nearly sixty years to harden these sites. The mountains there are as hard as the granite upon which Manhattan is built.
I suggest you take a look at S.L.A. Marshall's seminal book, Pork Chop Hill (the basis for the film). One of the little gems in there is the description of the network of tunnels and caves already in place and virtually untouchable by 1953.
Conventional wisdom is that the first three to seven days would be all NK. It would take that long for the tide to turn. The civilian loss of life in that first week would be staggering by any standard, especially once the bridges across the Han were taken out, leaving 5,000,000 plus (including the US installation at Yonson) trapped in the north side of Seoul.