There are tons of fantasy projects in development in Hollywood, and many that were previously reported on have gone dark, lacking updates in recent years. The process of getting a fantasy book adapted into film or television is an immense challenge with numerous hurdles to overcome. However, with the vast popularity of Game of Thrones, the early 2020s saw a period where various streaming services all wanted to replicate this success, resulting in shows like The Wheel of Time and House of the Dragon and new titles expanding on The Lord of the Rings movies.

https://screenrant.com/fantasy-movies-tv-shows-development-hell-delayed-list/