The reason the Iraqis haven't come out yet to support the Allies is both predictable and prudent. If the Allies leave before Saddam falls, those Iraqis (like the teenage girl who was hanged for waving to troops) will be tortured and killed. Once Basra/Nasariya/etc falls, watch what happens!
I think things will settle down quickly once we get rid of Saddam... the Iraqis will turn their true tormentors...