I for one would like to see another attempt made at a Dune movie. With a good script and art direction I think it has the potential to make a really epic sci-fi movie.
I actually think the 1984 version came pretty close to getting it right. My main complaints with the Lynch version are:
1. Too much use of guns. Why is everyone using projectile weapons in the fight scenes? When reading the novel, I was under the impression that most combat was done with knives and swords, because shields where effectively impenetrable (and potentially dangerous if hit by a laser).
2. Weirding modules. I understand that the weirding way would have been hard to show in 1984, so I can kind of give them a pass on this one. But the whole concept of the weirding module never made much sense to me.
3. The confusing script. This is a really important area, and to be honest I don't know if there is really any way to translate the complexities of the Dune universe for a general audience. I think the key is to somehow explain the relationship between the Imperium, the Spacing Guild, and the Bene Gesserit. The Lynch film used a lot of exposition and inner monologues to try to explain these things, but it just left audiences confused.