All of the above!
For real.
Honestly I have no idea of what it would take to make it happen technically, but the truth is, we already have all the pieces and the foundation here.
I see all of the media spaces in one app.
Menus down the side for a Buzzer-(twitter), Hive-book, Hive.blog, Buzzvideo, streaming,music gaming, different front ends with their own nuances -PeakD,Esteem, users can switch back and forth (I know I do), tabs for communities, and users can choose their preferences for each through communities, following, upvoting, their community trending, for each medium, as well as market places, exchange and investment, wallets, services, there really is no limit. User-centric and interest driven, regardless of what that means, intuitive would be helpful for adoption, but decentralized based on trustless analytics.
Just thinking through my keyboard, my .02 Hive worth.
Peace