Iraq will stabilize in 30-years time or turn into a Xiite wasteland "tomorrow", depending on the plan. Such stabilization doesn't mean necessarily the existence of the state of Iraq. Balkanizing is a last resort option, divide and conquer.
In the event of a fully-fledged Civil War, the US can support one side or if no side wants support just pull out, wait for one side to bleed the other and return once half the insurgent manpower is dead.
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"Tout ce qui est exagéré est insignifiant." ("All that is exaggerated is insignificant.") - Talleyrand
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