I find it interesting that GenZ and Millennials show a much smaller preference for their own decade's music. https://substackcdn.com/image/fetch/f_auto,q_auto:good,fl_pr... The 1980s are still doing quite well among all but the oldest generation. Is it possible that music may actually be getting worse? Corporatized, consolidated, computerized. Look at Hollywood now too: everything is a sequel, prequel, remake, reboot…
People listen to a wider variety of music and the same Billboard notion of popularity doesn't really paint a useful picture anymore. What plays on the radio or in TV ads is the lowest common denominator corporate waffle, and is played heavily, but it doesn't represent what people listen to overall.
I have personal playlists of everything from House music and 90s Eurodance to all kinds of J-Pop to 19th century folk music to early 2000s rock to 80s synth pop to orchestral music. I couldn't name a single Taylor Swift song offhand, but apparently she's pretty big.