A couple of thoughts -
New genres of music don't just pop up, they evolve from something that exists. After a genre has evolved through a couple of stages, it gets diluted. For example (in a genre about which I know something), we had "old time" string bands in the teens through the thirties. Then we got bluegrass. Then we got "classic country" that evolved into hardcore country and pop country, and then you're back to plain ol' boring pop music. In order to get a new genre you'd need to go back to The Skillet Lickers and play tunes similar to theirs on synthesizers, with a cuban beat. That'd be something you could still dance to.
Another thing is that too much social media and music streaming makes listeners lazy, and makes music producers make more music that they know people already like.