Peter Hum and Nextbop's Anthony Dean-Harris. You should read them, for I don't want to spoil their arguments by excerpting them here.
I suppose I should weigh in, and I may work out my thoughts for a long-form piece later this month. In the meantime, suffice it to say that I'm with Esperanza, with the added rejoinder I posted on Jason Parker's blog a few months ago on the declining utility of jazz as a brandname. More on that later, though.