I do wonder about actual numbers, though.
* Is the amount of music listened to in a day down? * Is the rate of music creation down? * Given some metric of diversity is music diversity down? * Given some metric of quality is music quality down? * Are there fewer artists per capita / in total? * Has the Gini coefficient really shifted?
I assume that for almost all of these, the answer is actually no. Presumably, technology has made making more higher quality music easier and cheaper than ever, and people are listening to more than ever.