At risk of being tarred with the dreaded pessimist brush, I note that U.S. plans for introducing Turkish troops to Iraq leave Iraqis cold. Who says so? Why none other than a spokesman for a Pentagon favorite, the Iraqi National Congress.
Moreover, the Iraqi Governing Council takes the rather common-sense position that no troops from neighboring countries should enter Iraq. Partitions happen when neighbors refuse to leave.
Then there is the little matter of actually getting Turks into the country. Assuming they'd never be stationed among Kurdish populations, they still have to go over, around, or through Kurdish areas to deploy. They might need U.S. protection every step of the way.