Good point, I mean, next thing you know we'll want to get some sort of audio enhancement by wearing some big goggle looking things over our ears and looks absolutely ridiculous wearing them.
Sorry, couldn't resist, but A/V is not a fashion statement, but as things move towards the home, there will be a variety of glasses available for people who need to look cool 24/7, and for those who don't care, then it doesn't really matter for them.
People also have different scales for what is important: 3D may work really well with this generation of new 3D displays compared to the old generations. Panasonic may have 3D plasmas available this Spring even.
But, it will take years and will likely be somewhat niche throughout the years. But, I really expect that within 3-4 years, if you are buying a quality TV, it will be a 3D capable TV. Likewise, when you buy a BD player, it will be a 3D capable version. Not a requirement, but pretty nifty.
Avatar definitely set some bars for quality, but there will be a number of movies, and potentially more than a few sporting events that offer 3D.