So you're completely comfortable if you are in a room with 2 other people talking loudly on their cell phones? I'm not saying I don't see it, but there's sort of a psychology to this. Basically when people talk, and you're within earshot, and the conversation is not directed to you, then you will as an outside observer feel a sense of exclusion. Any time you have human beings in close enough proximity for a period of time, and there is conversation that excludes one or more persons, then they will have a sense of exclusion. Most people will not vocalize this feeling of uncomfort, but it is there! At least from personal experience and the studies I've seen.

Obviously if you're by yourself talking on a cell phone or talking to your car stereo it doesn't matter much. But now picture 3 other passengers in your car and you're busy talking to the stereo, flipping through songs...? They will all look at your rather funny...... Especially since with voice recognition systems you'll have to speak up in a clear voice. So it would be much rather like a person yelling out loud, in a "are you listening?" voice about 1 foot away from every other person in the room. People will pretend to get used to it, but how weird is it? Give it some thought..

Calvin