> I do think it's inevitable that a film adaptation will let down any major fan of the original book. There's simply a barrier between media that cannot be reconciled, certainly not for any story as complex and expansive as Dune.

I don't think this is true. I agree that they are different media, and any adaptation will inherently be an adaptation. But that shouldn't lead to disappointment. You can appreciate both for their differences, as long as they each succeed in their own approach.