Those glasses are designed to be the party Polaroid of a generation. The person holding the camera gets the attention of everybody keen on presenting themselves, the bet is that putting the camera on your face intensifies this experience. Expect these things to get passed around a bit when in use, so there will quite some local virality within groups. This is good for immediate sales, but long term usage could suffer hard if market saturation coincides with the novelty wearing off. If there is one Polaroid at a given party, it is the center of attention, if there are three of them, they are all just annoying. The me-too buyers well get quite the opposite result compared to the early adopters.

If Snapchat sets up the glasses business as an additional revenue stream, it could well become a reasonable but limited success, if they set it up "strategically", maybe even selling at loss, I predict terrible failure.