Why Apps as We Know Them Will Vanish
The birth of the mobile revolution as we know it began with one simple sentence:
There's an app for that.
In the early days of apps and app stores, every new app was exciting. However, as apps have proliferated and new device categories emerge, and the info and services they provide become the more important aspect, apps as we know them are ceasing to be.
Do you care if you call an Uber from the official app, or the integrated Uber feature in Google Maps? Do you care if you were notified of a retweet from inside Twitter, or from a mobile Notification? Indeed, you might even prefer the latter to launching the entire app.
Advanced Notifications, Intelligent Assistants like Siri, Cortana, and Google Now, and the need to display content on all types of devices (and not just screens of different sizes, and not even just the devices that exist right now but those that will), mean fewer and fewer apps will be "destinations" in themselves.
In this scenario it goes almost without saying that the homefield advantage tends to accrue to the platform owners: Apple, Google, Microsoft, etc... Outside players like Amazon and Facebook, with their own quasi platforms and large user base, can exert a certain leverage as well, though the desire for full platform power helps explain both the Fire Phone and the HTC First. Neither wants to risk being reduced to "just an app".