The problem is that 3D, when it's done well, is an enhancement to the experience, but not an essential part of it.
In the theatre they hand you a pair of 3D glasses when you come in, you sit down silently facing straight forward to watch the movie, and then you drop the glasses in the box on your way out. The 3D is worth while because it's really convenient to do.
But at home? You need to find the glasses when you want to watch 3D, then you need to move around to make sure the viewing angle is right, then you need to take the glasses on or off when you wander around to do something else, then at the end you need to find a place to store the glasses again.
The enhanced experience just isn't worth the hassle.