What do the Iraqis want?
If 74% of the Shia and 91% of the Sunni want the US to withdraw within a year, "surging" troops may well be the worst possible option as it would undermine the Maliki government. Maliki is on the record after all, like Abizaid, saying no more troops. How weak would Maliki appear and how much less influence would he have with the militias and infiltrated security forces we're supposedly trying to shape with this "surge?"
Iraq has become politicized, and the solutions being discussed are being chosen more for their appeal here than their applicability in Iraq. We will not find a resolution by trying to fight Iraq's inertia. We no longer have that level of influence.
(Also: Hagel speaks out against the insanity of more troops.)