I don't think people get less productive using smartphones (but I'm not 100% sure that that's really what you are implying). I think the demographic of web user

I don't think people get less productive using smartphones (but I'm not 100% sure that that's really what you are implying). I think the demographic of web users has/and is still shifting. Desktops have always served the more technologically inclined people better and left less technologically "literate" people behind. Thanks to smartphones a whole new demographic of less "technologically literate" people gain access to the "web" (although mostly through native apps). It should be no surprise that we see less web searches, relatively speaking. The only move Google can do to capture this demographic as well is ever deeper integration of the search engine into Android.