Can they build sustainable revenue streams off other products? Do they have to? I think they will feel the pinch and need to create other, sustainable, revenue

Can they build sustainable revenue streams off other products? Do they have to? I think they will feel the pinch and need to create other, sustainable, revenue streams when they begin to observe a loss in search and advertising marketshare. I for one, beleived that Google would be smarter than that. But as the article points out, many of their other ventures and business units have not been successful. Maybe complacency in some areas is a result of being so successful in others.