I have several modern Analogue Productions vinyl re-issues of classic jazz LPs. They are uniformly superb.
My perception is that classic jazz LPs are often reissued, often by reputable labels that produce superb masterings, thusly providing fans with an easy, legitimate alternative to purchasing uber-expensive original pressings.
Kamasi Washington’s album from a few years back was very acclaimed and, relatively speaking, quite popular as far as jazz music is concerned. It’s called “jazz” for a reason. It ain’t “pop.”
It’s cool that this new Todd Field film, Tár, has inspired interest in classical music among the masses (particularly Mahler).
I don’t personally perceive jazz and classical music to be in a state of endangerment any more than they’ve always been “an endangered species.”
Considering how peripheral and marginalized these types of music have been for decades, one could argue the accessibility to all music via modern technology has made jazz and classical more accessible than they’ve been in a long time.