If fantasy blockbusters are going to survive they need fresh stories to tell. Fantasy has so much unexplored potential as a genre and yet studios keep sticking to the same safe medieval/old European type stuff over and over. Knights and castles and wizards and dragons, over and over. "Dark" updates to children's fairy tales. Disney's live-action remakes of their animated classics (which have been financially successful but not much ekse). It's boring.

The story of King Arthur is literally hundreds of years old. We don't need it turned into another dull action movie. Animation in the 21st century has done a great job at creating original fantasy worlds and stories (Spirited Away, Kubo and the Two Strings, Avatar: The Last Airbender and Legend of Korea), but aside from Pan's Labyrinth, live-action movies have played it safe. Harry Potter opened the doors for more fantasy movies set in the modern day but instead it spawned the YA novel adaptation craze. Hell, fucking Star Wars is all the proof you need that fantasy isn't restricted to one particular aesthetic.

I think it's safe to say at this point that people are bored of the same kinds of fantasy settings and stories, Game of Thrones being a notable exception. People need to create fantasy worlds and mythologies and get weird with it.