Emerging 3D display standards, uncertainty about how long they might persist in the marketplace before something better (such as something that doesn't require either passive or active glasses to achieve the 3D effect)
That is a very very long way off, if you want anything like the quality of what we see now with glasses. All the barrier screen tricks, and techniques that require your head to remain in one spot are not suitable for the home (non-gaming) market (or the cinema for that matter). There are some ways to do it, but they are even less suited to the home due to implementation costs.
It's going to be glasses for a while.
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