Just because you can doesn't mean you should
Perhaps sales are disappointing in Japan because 3d is a pointless technology that gives little (or no) benefit to the programme or film being watched. Far from enhancing the viewing experience, 3D Cinema or TV just ads more distraction.
Just because you can build a glasses-less 3d television doesn't mean you should.
Perhaps rather than silly gimmickery to entice people to watch their incredibly expensive television sets, they should invest the money into production companies making more engaging and less gimmicky television programming.