Jodorowky's DUNE is one of those "What If?" lost films, like Kubrick's NAPOLEON or Welles' HEART OF DARKNESS.

What if he had been able to make it? with Salvador Dali? It's fascinating to ponder.
David Lynch's Dune wasn't that good. And neither was the other attempts to film Dune.
I'm not of the opinion that certain works of writing are unfilmable.
Watchmen was considered unfilmable, yet Zack Snyder did a good job.
So was Naked lunch, yet Cronenberg also did a good job with it.
Fear and Loathing in Las Vegas- also considered unfilmable. But Terry Gilliam nailed it.

So I don't listen to those who say things are unfilmable. Kubrick said: If it can be imagined, it can be filmed.