It does have those things, but I think a lot of what you said about the later books also applies to the first. Taken individually all those points about political intrigue and mythology might work, but take all that and put it in a sci-fi setting and I’m just not sure how it appeals to a wider audiences.
I think what we’ll get is something very close to Blade Runner 2049 in terms of quality and box office returns, but I’d be very happy to be wrong.
I can of course be wrong too but one of the main draws for Game of Thrones was the political intrigue (alongside the gore, nudity and action of course), it just needs to be well written.
However with Dune itself i find the political aspects are quite light - House Atreides is very popular in the Landsraad ( basically the ruling council who are presided by the Emperor), thus becoming a political rival to the Emperor who comes up with a plan together with the Atreides' most vicious rival, House Harkonnen, to get rid of them.
They lay a trap for them by having them assume control of Arrakis, attack and wipe out the entire House in one action in the disguise of this being a sanctioned and official action allowed by the rules for House feuds (that the Emperor secretly supplied his elite Sardaukar troops made this possible because otherwise chances were that House Atreides would have kicked the Harkonnens' ass).
Of course Paul and Jessica escape, find shelter with the Fremen who turn out to be even more elite fighters than the Sardaukar. Paul becomes their prophesied leader (you may gloss over the fact that the Bene Gesserit are planting such prophesies into many cultures for future use, it's not that important for the main plot) and leads the Fremen to conquer the whole planet - which has far wider implications because of its unique ressouce which he now completely controls making him even more powerful than the Emperor and the Spacing Guild combined.
So - basic plot explained in 2 paragraphs which i believe is enough for a decent movie story and could be explained well enough through exposition and dialogue without dragging it down and putting people to sleep in their seats.
I guess the first movie may deal mostly with the setup - the plan by the Emperor and Baron Harkonnen, Atreides moving to Arrakis and settling in and as the first movie climax and cliffhanger the surprise attack and Paul and Jessica fleeing into the desert (depending on the cliffhanger it could be the last scene making their fate even more mysterious for non-readers or the final scene could be the Fremen/Stilgar picking them up).
The second movie could be about Paul and Jessica gaining control and become allied with the Fremen, building up the forces and starting the campaign to retake Arrakis including the final assault and political change in the movie climax.
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