That's literally the title of a Wall Street Journal op/ed signed by Senators McCain and Lieberman. This struck me as revealing:
As the surge should have taught us by now, troop numbers matter in Iraq. We should adjust those numbers based on conditions on the ground...
In a nutshell:
1) Rotate some brigades out until violence on the ground increases again.
2) Surge again to stop the violence.
3) Repeat. For 100 years.
Also, notice how the president and the Bush Republicans used "the surge" to toss responsibility for Iraq onto General Petraeus' shoulders. It's no longer Bush's War, it's now General Petraeus' war to win or lose. I can't think of a more cowardly and cynical way to ultimately blame the troops should things fly off the rails again.