tv spirit of the book or Lynch's?
The fact is moviegoers want to see spectacle for the eyes mainly..... and as far as we can read the 2 pages we have in this topic versus Lynch's version of Dune topic is pretty obvious not even the fans liked tv series THAT much.
The costumes like Fascists black shirts and uniforms, the Giger's influence and ships, the many sets including the golden sort of Arabian or Iranian/Turkish palace of the Emperor and the odd eyebrows and moustaches of characters, the bald skull of the Bene Gesserit perhaps influenced by Egyptian and Peruvian artificially deformed skulls..... all that was far better visually....
(and an image worths a lot more than bla-bla-bla!)
.... than tv series with so many people looking like beardless blue-eyed gringos wearing Arabian turbants. Tv series was a cheap effort with deadpan acting and poor performance.
I don't think we need a trilogy, it's possible to use "explanations" in some scenes like Lord of the Rings II and III (better than drawings in the "extended Lynch's version" which actually is not Lynch), at the very introduction or using flashback.
There's a thin gap between skepticism and cynicism