What woul happen if we just pulled out of Iraq in the middle of the night without them knowing it?

Do you think the killing would stop,get worse,remain the same or get a new leader,maybe Saddam again.Just think about it,suddenly we all just fade away gone. Would they become our friends. Do you think we should beat up every one who doesn't agree with us until they see it our way or the hiway and we all become friends and sleep in the same bed?