I can see the technology eventually evolving into a very useful tool for people who deal with dangerous conditions. Being able to stream video of an accident or robbery in progress would be quite useful.
As for the general public, it might eventually become useful, but the price and dork effect might slow adoption.
The largest obstacle for Glass to overcome isn't technological, it's social. As the author pointed out, pointing a camera at strangers in public is often unwelcome. In another article I read by a Glass early adopter, the issue of wearing Glass when entering a public restroom was mentioned. In her case, she decided to park them above her forehead, as people often do with sunglasses when indoors, so it would be clear to anyone that she wasn't actively wearing them or using them in that situation.
I think the dork factor Erebus mentioned can't be minimized. This is a bit like those earpod telephones. Screams dork. (In fact, haven't those diminished of late?)
Some kind of wearable computer will no doubt happen. But honestly, I'm not sure most out there are ready to look like the Borg in Star Trek?