“Our goal is to make sure that people can find what they’re looking for and get off the page as quickly as possible.”
SearchEngineLand interview with Marissa Mayer
This is an interesting concept. Google's value at the moment is to bring users to the information that they're looking for; at that point the user is finished with Google and is off to review the search results. But, what are the users truly looking for? Are they looking for pages with that may-or-may-not contain the information they're looking for or are they looking for the answers to whatever question they had? If it's the later (and I suspect that Wolfram Alpha is on the right track - then I suspect that soon enough Google will be supplying answers to users and want users to stay on their site for all their needs.