I guess I just don't believe this. Google is one of the largest and most powerful companies in the world. Having both people step down like this is incredibly strange.
I mean, neither of them even tried the ol' "I'm stepping down to spend time with my family" thing.
Larry and Sergey are basically best friends. Their involvement with Google, as a pair, has been receding for quite some time. Today's announcement was foreshadowed by the creation of Alphabet Inc. as a parent company in 2015.
Details in Sergey Brin and Amanda Rosenberg: Inside the Google Co-Founder’s Romance with the Google Glass Marketing Manager | Vanity Fairhttp://archive.is/kQvuR Febr 2015
I mean, neither of them even tried the ol' "I'm stepping down to spend time with my family" thing.