'I remember when I was playing in Spain some years back with Joe Henderson and Chick Corea, and man the audience gave us no love back. But at the end of the concert a couple thousand of them all put up their lighters or candles in the air, and that was how they showed their appreciation. I don't care for that, put those lighters away. Back in the day people would get up and shout when they felt the music. You guys need to give it to us on stage so we can give it back to you, it goes two ways."
I think one of the main reasons "jazz" has fallen off is the price of it and the audience it therefore attracts. $35 for 45 minutes of music and a drink minimum at some crammed club like the Village Vanguard or Blue Note only attracts tourists and people with disposable income.
I remember going to see Jack Dejohnette with Danilo Perez at the Blue Note, and most people I heard talking had no idea who they were -- they were all NYC tourists. The Blue Note is like the Disney Land of Jazz, complete with a gift shop upstairs so you can buy keychains.
It is nice, though, to see young guys like Chris Dave, Marcus Strickland, or Robert Glasper going out on tour with Mos Def or Erykah Badu, and then in turn drawing young people that normally would be listening to only hip-hop back out to their gigs. There is still some hope yet that people won't be priced out of the music and young people will start being introduced to it again.