One word: Iran
Since that is a powder keg, I imagine we'll be in Iraq for awhile yet.
Why wouldn't someone want to have a say in government? If we pull out now, someone will take over the fledgling government, and they'll end up in a dictatorship again. About the only way for Kurdish and women's rights to have any chance of making it is if they maintain a democracy.
We Americans made a mess, we need to be responsible and clean it up. I have to say I'm glad Saddam's out, though.