I'm not sure that is a fair comparison, Movies have a very strict number of people who can see the movie the first weekend (seats in movie theaters and not opening around the world, though the highest movie in the list was harry potter which I think had "world premier"). Where games have no limit on how many can buy it the first day, which is especially true since digital download has become so popular.
Yeah, that's a good point. Maybe Glass will be like prescription sunglasses, and people will have a separate pair? Maybe there will be a way to overtly disable the computer part or remove it entirely?
I think it's really unlikely that, aside from early adopters, people will have Glass "in place" when they're not using it, though.