Here's Terry Teachout's take, which argues that jazz has lost young listeners and should take a more populist approach, rather than exist as a marginalized high-art genre:
http://online.wsj.com/article/SB10001424052970204619004574320303103850572.html
And Nate Chinen's polite rebuttal:
http://www.nytimes.com/2009/08/19/arts/music/19jazz.html?ref=arts&pagewanted=all
There are always these polemics... is classical music dead? Is fiction dead? Is print media dead? Is hi-fi dead? A single strand runs through them: that if it fails to captivate the mainstream audience, it must be dead/dying. Is this true???