Matt Buchanan nails it, with one exception.
Buying a device is now buying into an ecosystem. If you want to have an Apple TV, a Google tablet and a Windows phone, you’re shit of luck. They’re disparate devices tied into different services that are barely able talk with each other – if at all.
Just ask anyone who’s tried to get Gmail to play nice on an iPhone or watch Apple-sourced content on anything other than iOS device.
Also missing: The Amazon Factor.