Call me cynical if you like, but I'm gonna venture a guess that the answer is "never". It ain't gonna happen, period. We're not the country we were in the 1940s. We're soft, dumbed-down, obsesed with not pissing off our enemies, rather than having victory over them. "Victory" is a dirty word. We're no longer willing to WIN a war. We only fight to stalemate.
Before anyone jumps me over that, think it through. Yeah, we got Saddam, but "getting Saddam" does not equate to "victory". Compare the current stalemate in Iraq with the postwar scenario in Japan and Germany. THEN, we went about things in an entirely different way. We made damn sure that the ENEMY knew that he was DEFEATED, and that he answered to US, and us alone. That broken sword on the deck of the battleship was more than symbolic. It was the end of a regime, from top to bottom. There was a new boss in town, and he didn't worry about "offending" the vanquished.
And if anyone thinks that sort of treatment is "cruel" and "insensitive", well, look at what happened to Germany and Japan AFTER we "gave 'em the treatment." They seem to have fared quite well.
No, we're not going to do what you suggest. We're going to keep muddling along, and the end state is not likely to be very pretty. I am NOT an optimist.
I agree completely.