Broadly I would agree with a comment made on page one that the situation may be comparable in the US, though I'd say that a lot of people in NYC or other large metropolises keep their fingers more firmly on the pulse.
When I did jazz radio in Austin, the guy I was splitting the show with hardly listened to any new players at all, though he was/is very familiar with earlier avant-garde stuff. I had then and still have a massive historical bent to my listening, but felt like it was just as (if not more) important to play music by up-and-comers that weren't getting as much attention outside of the East Coast or Chicago.
Rags like JazzTimes and DownBeat certainly support younger American players but I think they tend to follow the establishment tide and may be a little delayed in their reaction. And an older/dead artist or a younger artist working within established forms is much, much more likely to make the cover.