I'm not sure how many "potential buyers" there were to start with. In the TV/Movie business, it was the set manufacturers and Hollywood driving the whole thing, not customer demand. Set manufacturers needed to start selling everyone a new TV, even though they just bought one. Hollywood had a new gimmick to sell movies, which they've tried before and it didn't stick then either.
A few years ago at the NAB convention, you almost couldn't walk into a booth without being handed 3D glasses. The technologies were quite complex, like simply adding titles to any production, you now had to worry about the Z-space of the title. Camera settings were nuts to get the correct stereoptic convergence. Data storage and plant bandwidth demands went up. Displays looked dull because you had those stupid sunglasses on. You couldn't use today's common production techniques with rapid shot changes, camera angles, closeups mixed with medium shots, things going on and off screen - your eyeballs would unscrew and fall out of your head within minutes. It was headache inducing and everyone knew it.
Back in the 1950s when the first popular run of 3D movies happened, the production was very different - more like a relatively static camera shooting a stage where the actors performed. The only current content creators starting to use 3D were either trying to differentiate themselves or trying to not appear left behind.
The last NAB convention was very different. It was clear that 3D was swept into the back corner. It's still around if you want it, but they're done. When it comes back again, the displays will need to be much better and not require glasses, nor will the glasses-free displays require you to stand still in one of the 18 lanes which give you proper stereoptic perception.