They are still sought after by the retro gaming community, although there are many who like the professional studio monitors Sony made (BVM and PVM series) which have a cylindrical tube.
A friend of mine has one for this reason. He actually manages equipment and medical devices for a company that runs hospitals and was able to get one that one of their hospitals was going to throw away. It’s a really nice display for gaming on a CRT, but, to my eyes, not that much nicer than the Sony Wega he otherwise uses.
The Trinitron studio monitors also have RGBS (red, green, blue, composite-sync) BNC connectors, meaning that it's fairly easy to directly hook up bare arcade boards and get that real arcade experience.