Well, this oughta silence those mumblings that his international influence wasn't enough to get the Olympic bid.
Too early? I don't need to turn on Fox to know that those commentators are already saying, "Give me a break." I suppose it's already an achievement to have changed the mindset of the international community and given so many people hope. That is, assuming that people feel that way, and many do. Within America, of course, we've been a bit more fickle, fearing the stock market and unemployment and blaming Obama for not fixing everything NOW. Look at his rollercoastering approval ratings.
For that matter, I would bet that most Americans will be doubly surprised by this because we've paid so much attention to his domestic agenda lately (healthcare, cars) that nobody is thinking at all about nuclear proliferation. Afghanistan's had a bit more air time, but it's far from being the #1 issue on everyone's radar yet.
All in all? Too early, yes. Because so much more is expected from him. If he really has changed the world climate, metaphorically at least, it's a good start. But in order to silence the critics, he'll have to change the climate in reality. Kyoto II, here we come.
P.S. Very America-centric Nobel year. I don't recall so many Americans getting the prizes in years in the science fields. Wonder who will get economics.