The most realistic worst-case scenario? I don't think we'll go after Iran because they're too big and too powerful, and the current administration likes foes they can appear to soundly trounce. Bush & co. have been rattling sabers at Syria for quite a while. There will be a story that Syria has been involved in supplying and/or training Iraq insurgents. Bush and co. will invade Syria, but do so at a point in time where he can name a successor or say that a like-minded Republican must be elected so we can get the job done.

Then again, perhaps Congress will clip his wings, monetarily speaking. Perhaps nothing even close to this will happen, and I'd be glad.