We are mainly worried about the Kurdish issue now:
Gates also made a point Tuesday of saying that the United States is "ready to help resolve disputes over boundaries and hydrocarbons," a reference to widening tensions between Arabs and Kurds. Odierno called the Arab-Kurd rift his No. 1 security worry.
As I've long argued, even before our surge beat these enemies down (as long as we didn't abandon Iraq, I knew we could beat them), the only looming threat I could see to our success is an internal split based on the Kurdish-Arab divisions that erupts into violence.
I'm glad it is on our radar screens. I hope the Kurds don't come down with a major case of stupid and think they can survive as an independent country with hostile Turkey, Iran, and Iraq surrounding them.