Earlier quoted context omitted.
They likely won't get to that point. I expect them to end this Dune like the 80s Dune ended or very close. The points you bring up are really 2nd book and beyond and I suspect trying to add that in would just confuse people who don't already know the Dune story. They would also be tough to communicate in a video format, as compared to a book, as the depth will be lost. Regardless, I'm anxious to watch part 2 of the c…
I'm pretty sure Denis Villeneuve has said on the record that he plans on adapting Dune Messiah if the movies are successful, which is a great bookend to Paul Atreides story.
The end of the second act (in 3-act plays/movies) is either the nadir of the protagonist's journey, or the height of the tragic-hero's success. At least per storytelling books.
Most stories are told in 5 acts [0], and in comedies the hero/protagonist sees the darkest point in the story at the end of the 4th act. Thereby giving the hero the largest contrast possible in climbing out of the depths to their heights at the end of the story; the most cathartic path possible.
In tragedies, the protagonist/tragic-hero sees them at the height of their power/fortunes at the end of the 4th act. Thereby giving the protagonist the greatest fall possible; the most repression for the audience.
[0] The reasons for this going all the way back to Shakespeare and the odd interplay between the size of human bladders (~2.5 hours) and the burn length of the candles from the company near the Globe (~40 minutes).