Personally? I think there's lots of room for innovating search. Probably not in that area, but in a lot of other areas. Consider, for example, that the majority of the world will has an Internet connection only via phone. Mobile search is an entirely different beast. It is not clear Google's solution is the best here, and because the pattern of using Google on mobile is shaky enough that it could be supplanted with a convincingly better solution. That's to say nothing of the fact that Google's success in developing countries is actually not at all a given.