There were 3 strikes that killed the 3D market.
1. Initially 3DTVs had active shutterglass technology and many bought them, but there was little content available, and using the shutterglasses was a nightmare by many because of the short battery life or need to recharge them. Plus 3D inversion could happen and confuse watchers and give them headaches.
2. The rise of passive 3DTV with polarized glasses helped save the industry, but it wasn't long before many complained of the crosstalk issues and bad alignment of the polarizer barrier on the TV. Many were sent back for realignment, and it became a nightmare for manufacturers to cover the high cost of shipping and replacement of screen technology.
3. TV watching is typically a casual event of watching, talking to others, reading, etc., even during movies, but with glasses on, people have to pay more attention to the screen and lights typically have to be turned down or off to increase the image contrast. And don't get me started about the glasses. People hated them.
Also, especially in the US, people would not go to movies to watch a 3D movie, but wait for it to come out on bluray, and these were mainly projection TV users, but it did start to take money away from theaters. Go to a 3D showing now at a theater, and sometimes there are only 5 or less people watching. That is just not going to make money--AND, it's all about making money. People in Europe, Asia and Russia are still active 3D theater watchers, and that is why you see many releases of movies in 3D in foreign countries and not in the US. I've talked to a few TV reps and they always say, thank god 3D TV died when it did, and with the rise of 4K and 8K, TV sales have finally picked up again and the industry is very strong.
I had an experience at a theater that really drove the problem home to me about the glasses. In the same theater, several young children were there with their parents, and as I looked around, most had their glasses off after 15 minutes of watching. There was also a gaggle of 5 teenage girls sitting down the row from me. 3 refused to put their glasses on. I heard them whisper, that they wouldn't be caught dead wearing the glasses, as some boy might see them and laugh. Yeah, I laughed...
Maybe glassless 3DTV will save the industry, but without money being invested in the technology by the big companies like LG and Samsung, it isn't going to fly. Yes, there are small entrepreneurs investing in it--mostly for advertising, and James Cameron would like to see the next Avatars using glassless technology, but it's just not going to happen anytime soon.