Methinks the author really needs to read Crossing the Chasm, and understand the difference between early adopters and early majority. Google Glass doesn't need to be pretty and perfect right out of the box. It just needs to be far enough along that the early adopters will use it to shake out the bugs. A mainstream market is still a rev or three down the road.
What Google Glass needs isn't to be instantly perfect and mainstream. No, it just needs to avoid becoming a Segway. That's the hard part.
I think what muddies the waters here is Google's track-record with "beta" products. Namely, now-standard things like Gmail were technically in beta forever, but were practically speaking consumer-ready products by the time people were buzzing about it.
Not that I don't agree with your original point (I do), but I think the above is perhaps a relevant peek into the author's mindset.
What Google Glass needs isn't to be instantly perfect and mainstream. No, it just needs to avoid becoming a Segway. That's the hard part.