Of course not. If the Hitler had been killed in the assasination plot of July 20, 1944, would America have declared "Mission Accomplished"?
World War II was not about killing Hitler. It was about destroying the Nazi regime.
The Iraq War was not about killing or capturing Saddam Hussein. It was about destroying the Baathist regime and the Baaathist hold-outs are still fighting.
Any killings from now on are probably for the sole purpose of humiliating Americans.
Can you imagine the World War II generation speaking about giving up the war effort because of "humiliation" because the enemy managed to kill some Americans?
Or are we to stay until we can finally stop the attacks?
In World War II, did we not stay until the Germans and the Japanese stopped their attacks? If this war were World War II, today's date would be December 20, 1942.
That's what the Israelis basically tried in Lebanon for 18 years after their smashing victory in '82, only to end up withdrawing with Hezbollah slapping their rear ends. I'm sure Lebanon's a great model then.
In southern Lebanon, the Israelis had a salient into Lebanese territory while Hezbollah enjoyed a sanctuary in the rest of Syrian-controlled Lebanon.
In Iraq, the U.S. has absolute military control over every bag of rice that goes in or out of the Sunni Triangle.
The strategic situations are totally different. All the U.S. needs to do is to decide if it has the political will to press it's military advantage.