Google has the same problems Microsoft has always had. They have one huge cash cow that funds the entire company, and everything else is peripheral (a first world problem of course). Arguably MS now has more than one, but they've existed twice as long as Google and it's taken many decades to get to that point.
It never really mattered if PlayForSure, Zune, Bing, Windows Phone etc were big successes or not, the company was absolutely fine anyway. XBOX is a success, but the massive billon+ write off they suffered back in the day means even now overall it's probably not made a profit, and if so not much. IE has floundered for over a decade. They do have many successful products but most of them could die and it wouldn't matter.
It's the same with Google. As long as they're awash in a torrent of search advertising money nothing else matters. Like Micorosoft they do have some successful non-core products. Chrome, Android, GMail, Google Docs, Chromebooks. However all of those could drop stone dead and they'd be A-Okay.
This is why Amazon is so impressive to me. Bezos built two world class mega-businsses simultaneously from scratch. I can't think of a single other example of this anywhere.