I'm not sure I see this taking off as a general-purpose thing. The range is likely too short, and visible light is too easy to block. But I do see potential in

I'm not sure I see this taking off as a general-purpose thing. The range is likely too short, and visible light is too easy to block. But I do see potential in bridging: you could use this to get a signal across something that you can't (or don't want to) cross with a radio or electrical signal.