I would disagree with only one point - the terrorists do have a vision .. to keep Iraq from becomming a democracy.
However, they really have no base anymore - because we have killed or captured most of it .. and there is NO POPULAR SUPPORT for the terrorists. Since the election, more and more Iraqi citizens are turning in the terrorists .. and in fact .. because of that we have discovered tons of weapons, bomb making facilities, safe houses, etc. - all of that from citizens who are sick and tired of the terrorists.
The terrorist vision is to restore the Caliphate. Their base is the Islamic world. How much popular support they have is an open question - partly determined by how well or poorly they do in combat. I regularly read Al Ahram and Al Jazeera and occasionally look at other Muslim world publications, and at MEMRI and IRNA. The fight is played out there, too.