The Little Raven
First Post
I haven't read my Dark Sun books in a long time but I think the biggest "problems" with it using the 4e cosmology would be the Feywild and Shadowfell - it generally was just 100% about the world, so people who regularly wander through a different plane to travel 20 feet would be kinda out of theme.
If you're talking about eladrin, nothing in the game books says anything about fey step moving them through another plane. That was just a little fluff thing in the Races & Classes book which never made it into the actual game.
Also, the Feywild is kind of out of theme as coterminous with Athas, though it could be played up as a vision of Athas as it was before Bad Stuff Happened...
What's the point of the emphasis on wild? Are you suggesting that Athas doesn't have wilds? Or are you suggesting that a wild has to be some kind of overgrown forest? As a reflection of the world of Athas, the Feywild would be a mysteriously beautiful, but ultimately deadly desert.