Interesting article. Whatever happens, though, I doubt that our approach or that of the other NATO members who may be in place would be the same as it was last time.
Essentially, in Iraq we tried to inflict as few "unnecessary" casualties as possible and did not do the severe pacification common after wars (even though this forebearance cost us some of our own soldiers, I'm afraid). But I don't think it would be the same this time, regardless of the scenario that got us to the point of war.
Everybody, the US and NATO forces included, would be much more aggressive. And in the case of Afghanistan, NATO troops would be fighting in an area where the US had already taken out a lot of the bad guys and their infrastructure, and about which there was now a lot of on-the-ground information. So I don't think the prospects would necessarily be as bleak for the NATO forces as might seem.