Yeah but people aren't going to read 300+ page novels to understand the lore of M:TG, they want to have it explained in an entertaining way over the course of about 2 hours.
Also, The Thran would be awesome as a movie. Hell, I'd even go see a stage production of The Thran.
IKR they won't even give us Gremlins III, where they kill Hulk Hogan for real