DR, Oh, but such frivolity is fun, if not productive.
Where would we be today in Afghanistan if we had never invaded Iraq? Do you think we would have caught Usama and totally pacified the Taliban? Or would Saddam be up to mischief with our Afghani policy were he still in power?
What would things be like in Iraq if we had never invaded? How would Saddam respond to Iran's nuclear program? Or do you think the Iranians wouldn't be dabbling if we were only on one of their borders? If the Iranians were still developing nukes, how long before Saddam would have to reinstitute his program.
How about the Kurds? The Turks have had about enough of the PKK. And the Kurds in Iran and Syria are starting to exhibit more nationalism, causing more destabilzation in the region. Southern Kurdistan was protected as a no-fly zone before the invasion. With Saddam still in power (but checked from intervening by U.S. air power) do you think the situation there wouldn't be dangerous and threaten regional stability?
If we hadn't invaded, do you think Hamas and Hezbollah would have made peace with Israel, or do you think Saddam would be stirring that pot too?
And the oil-for-food money would still be flowing, with Saddam using it to build hospitals, universities, libraries, etc., without a single cent going weapons systems or, yes, those WMDs.
Bush blundering into Baghdad was kind of like the cops busting a meth lab. They busted the Big Dealer and a bunch of his cronies. They shut the lab down. They found some supplies, equipment and meth residue, but all the drugs were gone. Oh well, mission accomplished... no more meth lab.
But it wasn't a meth bust, of course, it was an invasion. Things might indeed be worse if we hadn't invaded. But things are pretty bad because we did.
Sun Tsu said about 2,500 years back that, "There is no instance of a country having benefited from prolonged warfare."
Bush and friends screwed up. You wave the flag, yell "Follow me," you really ought to be going somewhere. Things certainly may have been better if the country fully backed him. But it didn't and that's a real element of where we are now, and one he failed to perceive correctly.
I'd say get out yesterday, but I'm pretty sure we will suffered for it if we do. Forget for a moment what will happen in Iraq itself.

Who knows our absence may benefit the situation. The Sunnis, Shia and Kurds may get a group hug thing going with us gone.
But Usama, or whoever the fuehrer-de-jour, will say, "You see how easy it is? You need not be strong enough to win, only strong enough to kill Americans."
One feat of might-have-been prognostication I will venture. Had Bush not invaded Iraq, he would be criticized today for not taking military action to remove Saddam four years ago. I suspect many such complaints would come from people who today condemn the invasion.
