Lots of people say "don't get it" when faced with a new technology. That's the problem with generic platforms. "Why would I need a smartphone" is a similar question. The potential answers are obvious today, but they weren't 10 years ago.

I don't think it's about understanding, but rather imagining what could be done better with this technology. A lot of workers are carrying barcode scanners and tablets around in the field today because they need to input or access information. That's a potentially very lucurative niche.

I don't really think (and certainly don't hope) Google Glass will ever be socially acceptable, though.