I thought the point in time they chose to open them was pretty good. You can sell a mobile phone with video and text. But with something groundbreaking like the Glass this can be harder. Potential customers have nothing they can compare this to. They can watch the glass promo clips, of course but I think experiencing this first hand is way more intense and can be a strong incentive to buy one.
Of course, since there are Retail Stores planned, this whole argument is moot. To bad.