I don't know that the genre is being swamped by it, but store shelves in my area seem to be. I live in a rural area, so when I get to a shop and brows and see it full of romantasy, it makes browsing kind of suck. They've even got an actual ya series (glass throne) taking up a whole shelf.

I feel entitled as an adult to being able to walk over to the adult section and not have wonder if a book is a kids book or not.