I couldn't agree more. I think what has happened is that everything has become so fragmented due to the sheer volume of content being created that discovery is still a challenge. If you are someone who thinks that music, movies, novels, etc are in decline, then frankly you're just not looking hard enough.

For music, I'd recommend looking at Bandcamp Daily[0]. It's not all my cup of tea, but there are some amazing new artists out there spanning nearly every genre imaginable.

[0] https://daily.bandcamp.com/