Brookings says it's over in Iraq, deal with it.

According to the Saban Center at Brookings,

The US must draw up plans to deal with an all-out Iraqi civil war that would kill hundreds of thousands, create millions of refugees, and could spill over into a regional catastrophe, disrupting oil supplies and setting up a direct confrontation between Washington and Iran.

This is the central recommendation of a study by the Brookings Institution here, based on the assumption that President Bush's last-ditch troop increase fails to stabilise the country.....

Everywhere looms the shadow of Iran. In a "war game" testing US options, the Saban Centre for Middle East Policy at the Brookings Institution found that, as the descent into civil war gathered pace, confrontation between the US and Iran intensified, and Washington's leverage on Tehran diminished. Civil war in Iraq would turn Iran into "the unambiguous adversary" of the US.

Indeed, everything indicates that that is already happening. The study appeared on the same day as the Iranian ambassador in Iraq told The New York Times that Tehran intended to expand its influence in Iraq. US commanders now claim that thousands of Iranian advisers are arming and training Shia militias.

Also: I don't know if I fully agree with this SF Chronicle piece challenging the "nightmare scenario" of regional war that is presumptively going to occur if the US were to withdraw from Iraq, but it did spawn some interesting thoughts.