It's interesting. The publishers have decided that heavy themes are needed, but the public wants fun fluff. And they are providing none of that, so they turn to romance which has it already. And those heavy themes seem to be going nowhere.

Interesting too how there is a parallel in the movie industry. They also seem to have it completely wrong as judged by the large number of box office failures recently.

Now we'll get a deluge of Colleen Hoover type books. Which isn't bad, but it will help dry up the demand quickly as it becomes derivative and oversaturated. Hopefully some good romance and other genre authors wind up finding a huge following before the deluge happens. And hopefully the industry sees that storytelling matters more than their obsession with heavy themes meant to change the world.