But defining the current surge as a 'Plan A' is a dangerously dishonest move that ignores the history of the Iraq war to date. In fact, since 2003, we have run through at least six plans, none of which has succeeded. The Petraeus plan is something more akin to Plan F—truly, the last Hail Mary play in the fourth quarter. And if it fails, then we better start considering Plan G, also known as 'Get out of Iraq.'
The article goes through all the different "plans" for ignoring and/or occupying and/or subduing Iraq. It concludes that if the current plan doesn't work, then the last option will be to leave.
Since the current plan isn't working, and won't work, because Sadr and his forces can trivially reposition themselves wherever the troops are not, and so the bombs will keep exploding in different, seemingly random places, plan G will be to replace the Iraqi government with our own guys. The rhetoric will be, "These people had every chance to govern themselves and chose not to, and so we're in charge now."
Plan G - the one I describe - probably won't work either, but I think it's more likely to be the next plan than withdrawal. Bush won't admit defeat and he equates withdrawal with defeat; he would rather stress our military to (or beyond) the breaking point than admit defeat.