Kissinger thinks (or at least he pretends to think) that Iran has dreams of rekindling old Persian dreams of domination. He also says Bush will be looked upon more favorably in less than 50 years. I agree with Kissinger in that a cut and run withdrawal of US forces from Iraq would greatly empower radical Islam, not to mention an official kick-start of the civil war, but I would further elaborate that it would empower both [Sunni] and [Shia] radicalism, two very different components with highly different, and mutually hostile, objectives.
This is going to be huge. For some reason I can't wait for the civil war to really begin, I'm tired of the fruitless Green Zone foreplay.