I take the opposite message from all of this. It is nice to live in a world with such absurd levels of human productivity that people have the education and time for half a dozen "frivolous" hobbies. As a middle class person, I can learn carrot carving and wood turning and painting without expecting any financial gain, then stop at a free local art gallery on my way to hear some free live music at a bar.
Maybe the author thinks that the past was the time of greatness in the arts because the only people who could afford to participate in the arts were great.