This seems like it would be the perfect foundation with which acquire twitter right? A twitter acquisition makes sense under Alphabet in a way it doesn't under Google, no?
On a broader scale I think Google is gearing up to aquire its way out of areas of stunted growth for the company. A number of businesses haven't taken off:
Twitter :: Google Real-Time
Box :: Google Drive At Enterprise Level
8x8 :: Google Voice
(I own none of these stocks)