@1
It has less to do with the environment, than the microphone technology and the software handling the audio input.
If you look at Kinect, it does a much better job of doing voice, across the room, and doesn't get distracted by sounds coming from alternative locations or even the television itself.
Look for Microsoft to push for better microphone technology devices, probably even Kinect like technology with Microphone arrays.
A single Microphone doesn't even have the ear canal to bounce sound through for audio location, like a person's ear works, even this added with a bit more sound processing and there is no reason that the existing Voice recognition technology in Win7 wouldn't be seen as more Star Trek like.
The other point is, "when is voice interaction appropriate?" And there are times, like in a car that it is essential (again, the MS Sync/Car technologies do well); however, there are times that you don't want to be saying outloud everything you do with your computer. This requires more advances in UI and Voice Only UI thinking that is just at the begining stages now that the software and hardware can understand what we are saying.
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