The taps guiding someone down the street struck me as being useful to blind people. Imagine if white canes became museum pieces in our lifetime because the blind become equipped with GPS enabled wearables.
Well, white canes are more about locating curbs and fire hydrants and other people than they are about finding where you are on a map. But we can and should imagine a future in which blind people have prosthetic aids that give at least limited senses of sight to the blind, enough to avoid tripping and obstacles (and the white cane). That seems eminently within reach in the next couple of decades, if not the next five years.
I don't necessarily think that these advancements are entirely a bad thing; I just think that there is the strong possibility that they could encourage negative traits with future generations. Using technology to better peoples lives is a tremendous thing, but using it as a crutch to enable accidie is worrying. Perhaps I'm just a pessimist.
Here's a link: http://en.wikipedia.org/wiki/Visual_prosthesis