With the introduction of voice search like siri, it seems that google is doomed to me.
How do you make ad revenue when all results are verbal? Even in a best case scenario
you can sell one ad, not a sidebar full of them plus top advertisement driven results above the real results.
Add in ads?
"Siri where is there coffee?"
"BUY MORE METAL SIDING AT HOME DEPOT"
"Coffee 100 meters ahead at starbucks"