Why do you think not impossible? What sort of criteria do you feel could cause total market domination?
Just some, not necessary likely, but certainly at least theoretically possible, scenarios. I'm not going to comment on their relative likelyhood just now.
Xbox One domination:
- Kinect 2.0 turns out to be the new iOS/Wii Mote thanks to its time of flight tech. It can control WinRT apps, and developers are free to publish games through WinRT using almost any of the Xbox One's features, with a simple labelling system that limits their availability on platforms that don't support all necessary features. This brings heaps of great software in, and Sony can't counter with PS Eye 2.0 because it cannot see in the dark well enough, can't come up with SDKs which can do similar stuff quickly enough, and PS Mobile isn't nearly as good or accessible and SDK feature rich as Microsoft
- the HDMI In features of the Xbox One really take off. This is something that cannot be quickly compensated for.
- Microsoft's Azure Cloud features are a runaway success for online multiplayer, system turns out to be flawless and makes the experience clearly superior to any other platform available.
- Microsoft locks in or happens to hit just the right must-have exclusives, while not missing out on anything essential
- Microsoft manages to secure Oculus Rift to their platform, or manages to couple it to Kinect 2.0 in an amazing way that everyone wants to go for it.
Playstation 4 domination
- The Playstation 4 stays cheaper all through the console cycle, while also having superior hardware power that is easily tapped into for just about every game.
- The Playstation 4 controller, having the combination of traditional controls now polished to everyone's content (including previous 360 owners), while also offering touch, gyro, speaker, etc., turns out to be the perfect storm. Support for decoupling looking and aiming/steering/flying is added to more and more games thanks to Oculus Rift, but then becomes the big next thing and turns out to work the easiest and fastest with this method.
- Playstation 4 supports Oculus Rift and that becomes a runaway success, while Microsoft is late or just never supports it, and when they do, games have to make too big sacrifices to run in 3D at a decent enough framerate. Or maybe Sony locks it in for their platform (or maybe neither do and PC / Steam quickly becomes the dominating platform instead)
- F2P becomes the biggest thing for online gaming ever and Microsoft stubbernly refuses to acknowledge untill it is too late
- Playstation 4 gets some must have exclusives that everyone needs to have, while not missing out on anything essential
PC domination
- because the consoles are so close to PC, and AMD brings out cheap motherboards that have at least the same base spec, the PC benefits much sooner from the fact that consoles are much like the PC. Perhaps Steam does eventually release a successful Linux or Android based OS that cuts out Windows altogether (licence price advantage) with the co-operation of AMD / NVidia.
iOS Domination
- the new controller support in iOS7 is the shiznits and nobody cares about any other platform anymore.
Android Domination
- Google gets their shit together and designs the OS so that developers from now on can make software that works with any future and recent Android hardware, in a simple, uniform way, and they then release new TV boxes that support and do everything you ever need
I could go on for quite some time, but if you want more, hire me.