I'm not sure the correct TV remote interface exists yet. I have a tiny wireless keyboard-and-trackpad to control my WMC, and it's a real pain moving a mouse cursor around. Navigating a games console interface with a joystick is much more comfortable.

I agree that coupling the content-spigot-device tightly to the screen like "smart TVs" is a really bad idea until the technology matures enough that it can sensibly last 10 years. Otherwise people are going to end up with stranded icons. And then there's the usual privacy issues of closed devices (Samsung TV passim).