Jazz musicians are proud to be part of a tradition, just like folk or classical musicians. They see themselves as part of something enduring, something that transcends record sales.
When I hear a young musician play Caravan or In A Sentimental Mood, I don't hear a re-hashing of an old Ellington tune. I hear a conversation that's been going since the 1930s. I hear a new chapter being written in a long story. I hear a torch being passed.
Maybe your son will never connect with jazz. That's fine, jazz isn't for everyone. Somewhere out there, a 12 year old is listening to Bird or Trane or Christian Scott and saving up to buy their first horn. That's all that matters to us - that someone hears our music and is inspired to carry the torch.