Firstly there is no possibility of anything remotely resembling a 'victory' for the laughably named 'Coalition of the Willing', of whom there are precious few left.
Whatever happens in the future, and whatever the wishes of a future Iraqi government, America will demand a presence in Iraq to guard the precious, bloody oil which was the motivation for this entire adventurist fiasco in the first place.

Secondly, America needs to tread very, very carefully when considering an attack on Iran; it's unlikely that Vladimir Putin would take kindly to GI's on his borders.

Thirdly, America needs to watch out for China in it's dealings with N. Korea; these are the big guys and are not to be fucked with.