How I see things going, though of course I could be wrong, is that at home you'll probably just have a monitor, with your KB/Mouse setup of course, and you'll just plug your Surface like device into it.
I think the Console ideology this gen also supports my point somewhat, they didn't go all out for power with a big complicated architecture, they're just using x86 with a low power processor designer.
Plus with the tapering off with graphics gains that we're seeing you'll be able to create a fairly similar experience to the high end on lower power devices, which I think will benefit that type of device.
Also I also think Windows RT was a bad idea, they should've just gone all in with the Surface Pro, which I think is the future honestly.
Maybe this will seem like a very foolish comment in 3 or 4 years, but I doubt it.
I think the failure of that campaign says a lot more about the viability of Canonical's dreams than many are willing to admit.
For myself, and I'm sure many others, spending 800 dollars on a product I won't see for nearly a year is a bit too much...
I think it will come down to a few things:
1. Price - How much is a Windows 8/8.1 license these days? Why would a games console manufacturer want to bring on that additional cost?
2. Performance - Microsoft is too busy tripping over its own feet and supporting legacy enterprise applications and environments from decades long past to be able to tackle performance issues in a serious manner.[1] There's a reason the Xbone switches from Windows to an "Xbox OS" to run games.
3. Portability - Install a Linux flavor of your choice on your Raspi, phone, tablet, Steambox, Nvidiabox, whatever. The limitations will ultimately be upon the hardware, and the OS can get the heck out of the way and just let the games run.
Fact is, the best interfaces for serious gamers are either keyboard + mouse, or a game pad. Even if touch was the next big input, Linux has it, and Canonical is talking about merging Ubuntu touch into Ubuntu desktop in 14.04.