I will preface this comment by saying that I wholeheartedly agree with this policy and hope that it is implemented thoughtfully, unapologetically and without reservations.
What we are talking about here is creating a 'counter-insurgency' operation along the lines of the Afghan Mujahedeen of the 80's. At the time our enemy was the Soviet Union who are now the russians, our 'friends'.
What happens after these counter-insurgents have completed their task, will they then be unemployed? Perhaps they will then occupy themselves with some political aims. Perhaps some of them will become reborn to the glories of the Jihaad after the insurgency and start attacking the great satan.
We will then be again faced with the charge that we trained the people who are attacking us. We have to learn from history here. If we are going to train counter-insurgents, then we better damn well make sure we account for the blowback.
I think the way we deal with the "blowback" is that these operations should be done by Iraqis - by a loyal intelligence service composed of Shia and Kurds. Is there danger in reconstituting such a capability? Yes, but it, in combination with strike forces from the Iraqi army are what will get the job done and done in a way which will not be poisonous for the country after the job is done. The area in south central Iraq (the Sunni Triangle) should be under martial law for as long as it takes to get the job done. My hope is that after elections this period will not be long.