Yah, I'm heartbroken too about the slow death of 3D. How in the world can 3D -NOT- add immensely to one's viewing experience? Not long ago, I was at a Best Buy store and asked the salesman about 3D TV's. He laughed at me, right to my face. Felt like slapping the turd. He said "No such thing," basically. Then I walked him over to some projection units they had. A couple of them were 3D capable. He just shuffled, mumbled and I left.
Anyway, my point is that there are options still. I found, on Amazon, a number of 3500 lumen projectors, in the $500 range. At first I thought, "this is crazy, no way a projection TV is gonna be satisfying at all." After wrestling and rationalizing for days, I found a projector that had pretty good reviews and slapped it on my Amazon Store card.
Geez, was I ever surprised! I set it up with a cheapie 100" pull up/down screen and to my (aging) eyes the picture was way brighter and more colorful beyond anything I expected. At about 11' distance the picture is 94" and even with my TV watching glasses on, beyond acceptable. Of course, I had to buy new, active 3D glasses (for the past 8 years, I've been enjoying my 55" LG passive 3D flat screen - no longer available) but they're only about $20 now.
Just watched the new Tomb Raider 2018 3D Blu-ray (rented from 3d-blurayrental) and it was just as good of a 3D experience as I'd been enjoying for the last 8 years. I have the full retail version on order from Amazon U.K., but it'll be a while before it gets here. But, at least I know what I can look forward to.
One of my favorite's, "San Andreas 3D," was super and the new "Jumanji, Welcome To The Jungle 3D" was, too.
I realize not everyone will take easily to projection TV, but at least there's something to hang on to ...