I’m talking out of my ass, but I’m guessing the return is bigger for a blockbuster film compared to a series, especially with how expensive a film like this costs. Also, the cinematography and set designs are really built for a large screen. I would love a limited series (like they did with the Sci-Fi one) to really get into the details of the books, but I can’t imagine seeing something as gorgeous as Dune Part Two only on a TV screen.