Google gets 90 plus percent of its revenue from their ad business and dominates that area. All the cars, glasses and other services are attempts at diversification most of which have failed. Remember google plus, google docs and froogle?
For all that they spend on research, google is just a bigger form of what yahoo was. Where they go from here remains to be seen.
I work in mountain view and drive through google everyday. It's amazing all the experiments you see on campus.
This post was edited on 4/7 at 5:45 pm