Russ, I think you might be over-worrying about teaching jazz to youngsters... You yourself have managed to put a good life together, despite the handicap of being a jazz aficionado, why not them?!
It is up to each individual to learn how to incorporate the influences and work ethic that studying jazz bring, into a career in music. A jazz education doesn't HAVE to be a death sentence in the commercial world. But one of the things to instill is that jazz doesn't have to be a SOLE passion...
I see all too many fine youngsters RUINED by adopting attitudes that their teachers have at jazz college, that unfortunately I see a little bit in yourself, from time to time... And that attitude is that basically ALL music other than jazz is somehow inferior, that jazz is the pinnacle of expression, and to play anything else for a living is an admission of failure.
Nothing could be further from the truth. Jazz is a wonderful form of music, a true American artform, but it is not the only game in town. Classical music demands at least (if not more!) dedication and technique, and most popular forms of music need skills that, let's face it, will never be achieved by most (otherwise we'd ALL be having hits!). Ethnic and folk musics need the pupil to be as steeped in the form as jazz, otherwise it becomes a melange, and loses it's purity. Film music, as you know, requires skills WAY beyond a jazz education.
But all too many jazz educators look down on ANYTHING other than jazz at it's highest level, and that attitude is contagious, especially to young, unformed minds. It is no less blinkered than classical academics pooh-poohing anything but SERIOUS classical music. Or some yahoo going 'HEAVY METAL RULES!' at the top of his lungs
Music, in all it's forms, is a wide and deep ocean, but restrict young minds to just one lake, even if it is a Great Lake, and yes, you DO limit them later in life, even if it is just a sad dissatisfaction with having achieved great success in the music business, but not in the jazz field. What a terrible legacy to leave a youngster, the disdain for his own success
But encourage them to treat ALL forms of music more evenly, and you might just save them some of your worries down the line... Enjoy your success, and be content that many jazz greats achieved their best commercial successes by playing some of their LEAST adventurous material. Even they acknowledged that the public needs the hard stuff watered down a little!
But it sure didn't stop them from going out after the session, and blowing their hearts out to a small, devoted audience in a tiny jazz club AFTERWARDS... Best of both worlds!