While this is intended for the Snapchat generation, I can't help but imagine a more mainstream application for something like this.
Google Glass was too early for its time but its time may be coming. A pair of glasses that records everything that you see while wearing them is something that could exist in an era of unlimited storage which cloud computing will inevitably lead to. Artificial intelligence able to recognize and index objects, moments and people would make it possible to search our lives for memories. "Show me that time when I first noticed my wife walking out of Macy's".
There's a privacy concern that is gradually fading away as the generation that Spectacles was built for have grown up expecting cameras everywhere and not only not caring that they're being filmed but craving it. Older folks will hate it but the world will no longer be built for them.