Consoles are going away. This actually means that games optimized for a specific console will be a thing of the past. It doesn't mean couch gaming will go away. Games will run on Windows, Linux (Debian), iOS, and Android. This trend is about unified operating systems that affect the gaming industry and phase out 'consoles' and handhelds.
Sony
What's interesting is a 100 million console market that will be left for Sony to make a PS5 and convince developers to optimize for their hardware. Sony will be missing out on a lot of apps which will ultimately be their downfall. Sony could move to Linux (Debian) or Android (Amazon strategy), maybe both.
Nintendo
Good news for Nintendo, if they move out of their walled garden. They will probably attract third party developers.
It's up to them to choose between Linux or Android maybe both.
Valve
An example of a futuristic console. SteamOS is based on linux (Debian). It's interesting to note that they will be supporting Android. iOS and windows are out of the question.
Microsoft
Online gaming will be free again, although xbox live+ will exist (like PS3 era). Windows will still be paid, since they can't kill of that income stream. It will dwindle over time since all operating systems will be free in the future.
Apple
They have a similar business model as Microsoft. Apple TV will be your 'console' by adding a controller and iterating on (yearly) hardware releases. Apple is strong on low-end (mobile), Microsoft is strong on high-end (PC).
Google
Android is a linux distro for ARM architecture, while other linux distro's like Debian reside on X86 architecture. Eventually both will be supported.
Future
Microsoft and Apple will ultimately fail, since open platforms always win. Just like Microsoft killed Apple in '90s era. If that doesn't happen most hardware makers will go out of business which is unlikely. Gaming 'consoles' of the future are based on linux distro's probably Android and Debian. Who will win depends on which distro Nintendo, Sony and Valve will pick. Apple and Microsoft will pick one down the road. There are other companys to consider like Amazon, Yahoo and Facebook.
Cloudgaming will be part of the future, while digital downloads will still exist (especially for high-end).