As it stands now , I think that the armed forces are going to require a certain amount of clarification about where the administration is going to go , post saddam.
Iraq is going to require a garrison force of some size for the next year , while this could be handed over to UN supplied forces , its not something that i could see happpening. So that is going to require either an american or british , or combo force.
Without the reestablishment of the Draft , then the current force levels are going to drop off sharply as the national gaurd units go home and go back to work, new forces have to be rotated in at some point to allow third and fourth ID to return home.
All that has to be done before the next target of oppurtunity avails itself , and that puts it beyond the next set of elections , which may be a new ball of wax if W does not make it.
Right now , you are more likely to see Syria and Iran being dealt with , via covert operators, and Saudi Arabia being dealt with economically.
Finally as to why Iraq in the first place , as opposed to North Korea.
My opinion only , but North Korea is actually Chinas problem , not the US. Back in the days of client states, North Korea was the chinese/russian client ,and south korea was the american client. At this point north korea has slipped the leash and China is being pressured to deal with it.
The middle east was the primary concern, for over thirty years every country there has exported or sanctioned some form of terrorism. While Iraq may well have been technically innocent of Sept 11 , they are were the line was drawn. No one attacks the continental united states and dances in the street in celebration , no matter if they are Iraqi , Irani , or afgani.
Declan