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I don't really see this working for apps that aren't feed-based: Camera, Google Drive, Kindle, outgoing calls / texts, audiobooks, music, contacts... 'The App As We Know It' isn't dying. Rather, (mobile) OS'es are becoming more and more feed/content-oriented. I wouldn't be surprised to see the role of the notification feed and a homescreen of apps reversed: if you open your phone, you go to Google Now / notifications and you need to summon the apps drawers.