There may be something in what he says, but (based only on his name, and not having read the entire article) I presume that he is Japanese, and partly for that reason he is extrapolating into what “most Japanese” know about American music, and similarly for American music (and listeners). I’m sure that there’s some truth to the observation that American listeners have gotten “lazy” in this respect. In the same way that most of us only know a single language (and based on my reading and listening, they don’t know that one anywhere near as well as they ought to), they only know the music that they’re exposed to on a repetitive basis: Top 40 and the like. There’s not a great deal of experimentation in the mass market, then, for any cultural aspect of American culture: music, language, writing, art, television, even sports and nearly any other kind of entertainment venue that you’d care to name. However, because of the size of the entire market – over 300 million individuals – there is still “a large market” for whatever particular niche exists. Personally, I’d question where his “3%” figure comes from. That is, I would like to see the opening (badly written) assertion “The current market share of Jazz in America is mere 3 percent,” explained.