I'm not so sure about Dune. I think it calls for (at least) a limited series, rather than a film. However, it's about far more than Paul. There are lots of complex themes and the most important setting in the story isn't on Arrakis; it's in peoples' heads. I think you can make a good show. I'm not sure it'll be Dune.

I'd say that Dune, as a single book, is a metaphor for a local Arab community rising up to overthrow a pair of colonial powers (Brits/Harkonnen and American/Atreidis) to take control of their own oil reserves (spice). It is a story about Jihad, a word that is used many times in the books but is notably absent in the latest film. Start changing too many characters and the metaphors to our real world fall apart.