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How would/did a regular person even watch a 3D movie at home? I had 1 friend that had a 3D TV complete with 2 pairs LCD glasses. I didn't know anyone else who ever had one. I have a few movies on my shelf that have a 3D version in the box, but I've never had a way to watch them.

3D capability is still common with projectors. So for folks who care about it, there are still options for new display devices, just not direct view sadly.

Sad isn't it. It seems so stupid to actually remove the support for a format, even if they stop shipping the glasses by default. I still have Panasonic plasmas and the 3D is really excellent.

It never helped that they released a bunch of movies that weren't actually filmed in 3D with 3D added in post as a gimmick to sell copies to the 5 people with 3D TVs, and anyone who saw those immediately went out and bought a TV without 3D support.

Not dead, only spelt dead. Look for releases, and there are. Could be more of course...
https://the-jh-movie-collection-officia ... D_releases
https://bluray-disc.de/3d-blu-ray-filme ... gt?page=44
lists 45 pages with up to 10 entries
There are movies that are definitely worth 3D.
Animation movies profit so much that I started to buy them and I am still searching for more.
The 3D rerenderings of Pixar's catalogue are work of art, extended, with no shortcuts taken.
Once you have the complete playback chain together: it's a treat.
3D BD player, 4K3D OLED monitor with circular polarized, passive glasses circular polarized.
One weak component makes the whole thing moot.
3D BD players are still to find, it does not need Oppos, the other ones do work well too.
Harder to find: LG OLED55C6V, LG OLED55E6V, LG OLED65C6V, LG OLED65E6V
Glasses: There are still original LG passive 3D glasses around.
Good transmission, minimum loss, good separation. And no batteries.

3D was so in the 70s-80's but I never felt the need to go out and buy a 3D TV.