I keep reading from various sources that the United States does not have the troops to invade Syria or Iran. This is almost of small or no consequence as Bush has a history and an agenda of using one faction against another.
To this end the United States is training 20,000 Kurds to oppose Iran and it seems also Azerbaijanis. If Bush can add the Arabs to this group he might be able to come up with a formidable force to oppose Iran with little of our own troop involvement. Looks better for us if no one knows.
You make a very valid point however long term management of such things is not something I would expect the Bushies to do very well with. War in general is unpredictable and underestimating anyone of these groups or someone elses influence over one of these groups could backfire much worse than Iraq itself. Look at Kosovo. We actually lost the war to Milosovich in practical terms. The Russians took control of the airport in Kosovo. It took them several months to actually get Milosovich after the war AND last time I looked into it virtually nothing had changed. Milosovich's family still controls Serbia minus Kosovo which Milosovich was willing to give us without our invading. Milosovichs wife is in exile in Moscow calling many of the shots back home and the sons remain in Belgrade along with virtually all of Milosovich's Cronies still in place controlling the Milosovich empire. Short term what you suggest may work very well for the Bushies but the longer term I think we wont be able to control much of it if China and Russia are willing to go to war.