Basically, these are nostalgia careers. There is nothing wrong with loving old things, but they make sense as a hobby, not as a career you need to make a living.
I say this as someone who was (for a time) married to someone who "followed her dream" at the advice of her dad, and majored in operatic singing. Good as she was, all she was able to get as a job was in an opera chorus, while teaching music in elementary schools. The opera she was in was eventually closed, the music program in that school district was canceled, but neither paid much anyway. Eventually she took on more loans (while I paid rent and groceries etc) to get a degree in speech pathology.
The economics of this was driven home once when we were together, when we went to see an opera in San Francisco. There was no amplification, but an actual orchestra. The ratio of audience members to performers was ridiculously low. The house was mostly full, but it wasn't that big a house (how big can it really be with no amplification?).
Meanwhile, the same evening, a young coworker of mine was attending an EDM show right across the plaza at the Bill Graham center, so we walked over together. That show was basically a couple guys on stage with laptops. Apparently not much on stage resembling musical instruments. And the crowd lined up outside was so enormous it made it hard for me to find my wife and to get to the opera house.
Some people see that as sad, I guess, and in some ways I can agree. (although I tend to prefer electronic music more than classical, I don't see the point of attending a live show if the music is pre-sequenced, that's just weird)
Regardless, this is reality today.