I'm still amazed how well they managed to pull off part 1. There are really good reasons why Dune was known as an "unfilmable" franchise. But by Shai Hulud, they fuckin' did it.
It's too much to hope for, but there's not much I wouldn't give to see them continue making more of the books into movies.
Don't wish too far down the line. After the Original author passed away and his son continued on in the series....well let's just say the apple rolled a bit after it fell from the tree.
That's God Emperor of Dune, and Frank Herbert (the original author) was the one who wrote it.
One of the best Reddit comments I ever saw was in response to the announcement that they were considering also adapting the second book. Someone just said "do God Emperor you cowards".
I've read all six of Frank Herbert's Dune novels and nine more by Brian Herbert and Keith Anderson and I'm planning to continue. I'll happily wish for as many movies as they could possibly make. Prelude to Dune in particular was an amazing series of novels. Probably among the more difficult to adapt into movies, but they've apparently done an amazing job with the two they've done so far.
I haven't met or talked to many who have read any of Brian and Keith's novels, but from my small sample size (and from my own personal experience), I get the impression not that they're not bad, but polarizing. People either love them or hate them. The most hard-core Dune fan I know says he likes the Brian and Keith books better than Frank's and he wishes they'd made the movies in chronological order -- starting with Legends of Dune set 10,000 years before the first Frank Herbert novel and detailing the start of the Butlerian Jihad -- rather than starting with the first Dune novel published. He also recommemds reading Dune in chronological not publication order.