Apparently you missed my sarcasm. I agree, it's highly unlikely that the North Korean missile, with payload or otherwise, would reach American soil.
Sorry, I must have ducked when I read that, because the sarcasm went right over my head.
Well I've definitely not studied the statistics on Iran so I will bow to your knowledge there but I do know that in 1991 many of the same arguments were raised about Iraq. At the time I believe Iraq had one of the most advanced and sizeable armies in the middle east.
Yeah, they said the American tanks would be slaughtered by the tank hordes of Iraq, the SAMs would knock our planes out of the air. This was before we knew a M-2 Bradley could penetrate T-72's frontal armor, and how big a role air power would be. Keep in mind, that was the first ever Cold-War style battle ever fought.
Iran may have a big army, but it is nowhere near 'advanced' when compared to the US. Iran would be forced into an insurgency-type war (Like Iraq). The problem is that the Iranians for the most part support their government and will all oppose Western forces, making it much tougher than Iraq, where the Iraqi do support coalition forces, and their new government. We would be fighting all of Iran, verses less then 15% of Iraq.