Maybe this is naive of me, but I don't really look forward to a future where I walk around making sure people in my vicinity are glowing red (or green, for when I do something heroic).. I realize that having some indicator is a huge plus over having nothing but it just feels so sterile. Perhaps this is as much a reaction to always-on everything, but there's something especially off-putting about taking the concept of eye contact and making it a consumable, recordable activity. Technology thus far hasn't really encroached on or been able to imitate this face to face interaction..

Alternatively, some kind of wifi/3g blocker or jammer, could be the answer.

I know that in much of the US these devices are illegal, wouldn't be surprised about other places.