The OP offers a hypothesis: Billboard changed its ratings method significantly, and many formerly 'popular' artists weren't.

And now, all we have is dance-groups on stage

If you only listen to mainstream music I guess. Whatever you’re looking for is pretty much out there but you won’t find it on the radio.

Have a look at something like bandcamp, or a new music podcast. There’s lots of great stuff out there.

Sure, I'm just saying the good stuff USED TO be mainstream.

But I'm also getting old I used to get excited about new music I could find but now I'm a bit more "jaded". :-)

And The Rolling Stones and Paul McCartney and The Who…