"Parody" is kind. I have thought for a decade or two about what might have been his intent in making the movie as he did, and I am still at a loss. For a while I thought he was just fascinated by the wonderfully evil Von Harkonnen character, and let it take over (and rot) his brain. I saw the thing a (bleeg) second time with a friend, and just gave up searching for an explanation for the butchery other than that he really hated the movie, and, sensing a market for the more perverse images in Dune, seized on them, and got paid well to do an asassination job on it.
As you may be able to tell, I did not really like it much.
That said, it would be extremely difficult and costly to do a fair job on the movie- too long for one episode, I think. Unless the theaters were equipped for an overnight stay of the patrons, at least. Actually, to me it is nice to see a vision too vast, an imagination too unruled to be reduced to a three-hour non-involved absorption experience in a theater.
I know what a hobbit looks like, and I also have my cherished "Dune" in my head and heart. I am happy to keep my own images.

Capitalism searches out the darkest corners of human potential, and mainlines them.