I'm often criticized for worshipping everything Obama does (by people who literally cannot ever find a complimentary thing to say about him, even when he does exactly what they want him to do) so it's a weird pleasure for me to say this. I wish we weren't sending more troops to Afghanistan.
I like the idea that we're at least setting a goal for leaving that country, but the time we spend between now and 2011 (assuming we're not trapped then) will likely be wasted. It won't improve conditions, it won't prepare the Afghans to defend themselves. Nothing can. Nobody has ever whipped that place into a civilization and I can't imagine we will either. Most likely we're just going spend the next few years funneling surplus weapons to warlords, which they will use to kill each other with after we're gone.
And yes, they will blame the Americans for it.
If we pulled out now, the place would wind up in the exact same chaos only with less of our descendants' money wasted. On the plus side, like all wars, this one could stimulate the economy. It's government spending to create jobs! I'm for that; I just prefer the spending that gives me a bridge or a dam or something and doesn't kill a bunch of people. Call me irresponsible.