Kinect motion control permeates the entire Dashboard experience. … Voice control goes almost as deep as gesture control, and is infinitely easier to use. This too, was once available in the Kinect Hub, but the contemporary implementation is heavily refined.
via Xbox 360 Dashboard update review (fall 2011) — Engadget.
For connected TVs the biggest technology obstacle is input devices. Being able to use gestures + voice control without even having to pick up a physical is a huge win.
However, the hardware may be too expensive. Putting an accelerometer in an otherwise simple remote may be the sweet spot for cost/benefit tradeoffs. This is the strategy for Wii, LG’s Magic Motion remote, and the new Roku.