@jennythelib - The school I teach at still has one functional laserdisc player to play the laserdiscs they short-sightedly invested in (before my day). When that breaks down, I think they'll just abandon all the discs.
It's funny how some technologies stick around. I still have an overhead projector in my classroom that I use several times a week!
An uncle of mine is actually really into to the Vitaphone movies. He's part of the Vitaphone Project, which is just hobbyists who are trying to restore old Vitaphone movies and copy them to 35 milimeter with sound on film. He says that the old sound discs are actually quite well preserved and often have better sound than sound-on-film movies from around the same time period.
Apparently, that jerkiness we associate with old movies is just because the prints degrade over time. When audiences saw those movies for the first time, they would have been clear and smooth and not at all jerky.