“A Canticle for Leibowitz” would make a terrible movie. There’s almost no action at all. No battles, no mysteries, no Fight to Save the World From the Forces of Evil (with the monks, it’s all about preserving, not saving). In its own way it’s a very “quiet” novel.
BUT – I would LOVE to see this done as a mini-series…say, 9 or 12 episodes (3 or 4 to a novella). That way it would be far easier to concentrate on the details of the plot. Created as a character-centered think-piece I believe that a televised version of “Canticle” could be brilliant. It would just take the right people in the right place at the right time.