Bush and company are going in no matter what is or isn't found in Iraq. And they'll go in next month, almost certainly. Because, as noted, this has really little or nothing to do with terrorism; the intent is to redraw the map of the Middle East. Nothing more, nothing less.
The "war" will last maybe a couple of weeks. If that.
The repercussions...those will go on for decades.
As a Brit once said of World War II, "The duration's gonna be a lot longer than the war, mate."
Joe's original prognostication, and the first followup.