I guess I'm less worried about the cost than I am about the functionality. I think adding this to the phone is pretty cheap since the speaker and microphone are already there. It would be nice to not get fingerprints on the display anymore, but I could see issues with accidental gestures. Just moving the phone to your ear could cause a recognized gesture. I also wonder how far away this would work. For a TV, it would have to work at 10 to 20 feet away to be useful. This could be very difficult to use for people who talk with their hands. But, I guess it's like all new technologies. We have to get used to it.