The real problem with 3D video is that it requires a lot of production work to get right. You can't just record in 3D and expect it to work. You have to careful

The real problem with 3D video is that it requires a lot of production work to get right. You can't just record in 3D and expect it to work. You have to carefully manage focal length. And when it comes right down to it, it only adds things to carefully crafted shots like the bioluminescent plants in Avatar, or the birds flying through hallelujah mountains. And the fact is 90% of television doesn't have visuals that are going to benefit from that. The remaining 10%, few people will miss it when it's gone. There just isn't a huge value proposition for most styles of video, and there's not a clear case that 3D video is a superior art form to 2D, it just costs more and takes more production time.