While 3D in theaters is still very popular, it seems as though 3D television just ended up being a fad that hasn't caught on. Most of the TV's being bought today are not 3D and I don't think there is much pressure to sell them in stores anymore. They might be moving on to 4K TV next.
An installation of popular graphics card driver may come with support for the 3D TVs - which the graphics cards themselves may have been created to support. While 3D TVs may not have pierced the general market quite yet, they are still very much a part of the enthusiast video community, especially those who are more skilled and well off.