To extend the “that will never work” part, for “Game of Thrones” author George R R Martin once said,

From basically the mid-’80s through the mid-’90s, I was involved in television. Whenever I turned in the script in my first draft, I would always get the reaction, “George, we love it, but it’s five times our budget, so… Can you go back and cut things?

And when I finally left television and film and went into prose in the mid-90s, I said, I don’t care about that anymore, I’m going to write something just as big as my imagination, I’m going to have all the characters I want, and gigantic castles, and dragons, and direwolves, and hundreds of years of history, and a really complex plot, and it’s fine because it’s a book. It’s essentially unfilmable.