Let's change the way we think about Google Glass for a moment. At the end of the day, they're just too jarring for the average person to feel comfortable wearing in public. To people who don't know what they are, they're weird. To people who do, they're $1,500 worth of easily-stolen accessory being flaunted on your face.
But for performing specific-tasks, Glass makes sense. If they can help you perform surgery, why not?