The problem is that KJA is an attention whore, he is so sick that he needs to be remembered like an equal to Asimov, Herbert, Clarke or Bradbury.
I read some of his work in the SW universe and read the 6 prequels and Hunters and Sandworms, and there is one thing that is common to both.
He need to create a story that covers thousands and thousands of year, he want to create mega saga like Foundation...and in its core Foundation is very similar to Dune...keep reading
As like some of you know, The first book (foundation) was really 3 stories publicated in some sci-fi magazine, later it was made into one book (hint, hint) of course 40 years later no one remembers that thing and everyone thinks that it was written like one book.
Many, many years later Asimov closed the saga tieing the Robots Era, with the Elijah Baley saga, the Early Empire saga and the Foundation books, altough those books weren't that perfect like the orginals, they blend very well in the masterpiece he created, a saga of like 20 books with a story that covers from now to 30000 years in the future.
KJA wants to do te same, in 10 years there will be like 5 or 6 more Dune books, maybe ''Harum of Dune'', ''Agamemmnon of Dune'', ''The last granddaughter of Duncan Idaho the Kwisatz HAderach of Dune'', etc.
The only difference is that will be a mismash of crap he will fill the new Dune books with the info necessary, so if anyone choose, wont have the need to read the 6 original ones, everything will be explained in these new books (prequels, inquels, sequels, etc.)
The worst thing, in 15 years or 20 when asked in a library about the saga Dune this will be answered:
''Yes, that saga is like 30 books written by KJA and BH and containing 6 books in the middle written by FH, father of BH, if you want them start reading this one ''Harum of Dune'', i suggest reading them in chronological order''
The fuckers will dilute FH's work raping his universe and adding his work as a mere foot note.