Ha! I interviewed at google and told them glass was a horrible consumer product and that they should have started with a market that wouldn't mind looking stupid (or skiers who already wore goggles so they wouldn't look stupid at all). The point I made to them was that they engineered an incredible device but hadn't validated the market. I suggested it would have been better to start with something like skiers because they already wore goggles and helmets. So, you wouldn't need to get the product so small to see how people reacted to it.
Needless to say, I didn't get the job. It was really funny to watch Glass (which is a cool technology) totally fail because it's a stupid consumer product. And, I'm no Steve Jobs. It was absolutely predictable that Glass would never work as a consumer product.
And, if you want to make it work for manufacturing, I think you'll need to scale up the form factor. Why wouldn't you make it a safety goggle too? Think about all of the engineering effort that went into shrinking this into a small, completely impractical, package.
Anyway, I think that this was not only predictable but it also shows a company culture where people can't tell the emperor that he's naked. It's not like I was the only person that took one look at glass and knew you couldn't leave the house wearing one. But, that message was pretty actively suppressed at Google.