Much of the public discourse over the benefits/dangers of a "timetable" for withdrawal from Iraq try to paint a picture in black and white that is more a matter of perspective: Is a timetable for withdrawal a claim of victory or a concession of defeat? (I.e., is the glass half empty or half full?)
The establishment of a timetable for withdrawal is really nothing but a change of attitude. Under the Bush administration, the attitude has been that we intend to stay in Iraq until we need to leave. A timetable for withdrawal expresses the attitude that we intend to leave unless we need to stay.
And withdrawal is an attitude that American citizens and soldiers have grown to like.