I think it's reasonable to imagine a not so distant future where surveillance equipment can cover all those things: 1) are ubiquitous, 2) can record excellent audio quality (and perhaps be transcribed and automatically analyzed), and 3) is cheap enough for any venue (or random person) to own.
Exactly, the article even mentions Google Glass. Think about the future, what if everyone is recording you, your casual interactions in public. Gets as creepy as those videos pretty fast.
