Bit by bit for years we've been uploading our personal information into the public domain. If I tell Facebook I'm a married man who is in to prostitutes and Graph Search exposes it to the world[1], I've erroded my own privacy unwittingly.
If I walk out of a brothel and someone catches me with their Google Glass, now they've eroded my privacy. At first it seems like a small step, no one has Google Glass, what are the odds of me being exposed? But time marches on and technology becomes ubiquitous (especially technology as legitimately useful as Glass). New technology comes along and builds on top of the old and it wears away at our privacy, a little at a time.
I'm sure the married men on Facebook who put they are in to prostitutes did it under the pretence that it would just be shown to whoever they are friends with. Suddenly Graph Search comes along and they're exposed. Apply the same model to Google Glass, and you end up with something like what the author is talking about.
It wouldn't surprise me at all if this becomes standard in 50-100 years as you can't really stop the march of technology and miniaturization. Will it be Google that does this or someone else? It doesn't really matter. It is something to be aware of.
Just because the integration of all these disparate technologies and services hasn't happened doesn't mean it won't.
I remember this article a few months ago: http://www.nydailynews.com/news/world/cyborg-professor-claim...
I sided with the guy with the glasses, after reading this article, not so much.
*Note, when I first read this article, there was no freaky picture with it.