I think the thing that folks seem to glaze over is that Conan is hard sell of a character these days. For better or worse, he's a cliche and I think this will pose a problem in getting serious movie makers interest.
I for one would love a Conan TV series like a cross between Game of Thrones and Spartacus. Though I suppose Kull would be a a better choice given Kull isn't as globe trotting as Conan. But in an ideal world....
I think he has been made a cliche because of the poor versions of him out there, either the REH ones (flim / cartoon) or the knock-offs (He Man, etc). So say Conan or swords and sorcery and people thing big dumb musclehead fighting a giant snake for a bird with big knockers. We all know there is much more to REH and the genre than that, but it has yet to be treated with anything like the respect of LOTR, GOT, etc
Do you really think He-Man had a detremental effect on Conan then? I don't think so at all given He-Man was for kids and was defferent enough to stand on it's own. Plus He-Man was simply great and inspired many to seek out Conan.
I personally would put it down to things like Conan the Destroyer and movies like Barbarians, Death Stalkers and Beastmasters or any of the many really bad sword and Sorcery flicks. Actually outside of Conan the Barbarian, I cannot think of any sword and sorcery that isn't hysterically bad.
Sword and sorcery has never been taken seriously as a genre for very good reasons. It's often very sexist with dated views on other races of people and the ideology that might makes right.
I think Dark Horse handle Conan in the way I think he should be handled. I see a far more interesting Conan in those comics and the story telling is modernised making it a deeper more interesting world.