It's very hard to uninvent things so very unlikely that things disappear.

A bit like other sorts of music. Blues and Jazz are also things that go round in cycles of popularity. When I started listening to music outside of the top 10 in the latter 60's there was a blues revival going on and there have been two (perhaps three) since. Jazz still perplexes the same number of people as it did back then and I'm never sure whether it is in good shape or not - every Sunday lunchtime there was more jazz in pubs than there seems to be these days. There was a lot of folk influences around at that time too and I'm sure there will be in the future.

When I bought my first John Mayall album (Crusade) it opened up doors to more than Mayall and the guitarists.
When I saw and bought Pentangle albums there was a lot of trad folk referenced there as there was with Judy Collins, Fairport, Roy Harper and lots of other people I listened to.

My wife sings and really likes jazz/standards from the 20s-50s which predate us.

So much these days is preserved and available that never was so it makes it even more likely tht it will survive.

Back to working whether I can get away with a couple of jazz chords on Danny Boy for St Patricks night... (and I think I can!)