The tricky thing about Dark Sun is that it is, by original design, harsh, brutal and unforgiving. Its original incarnation, for all intents and purposes, required starting at 3rd level and having at least one other character ready to play, as death was as common as sand on Athas. Dunno what 4e did to it, since I skipped it, but that's what Dark Sun was originally.
I dunno if 5e's overall approach to the game of D&D really supports that truly brutal and unrelenting approach to a campaign world. It can be, definitely, but I don't get the impression WotC is interested in exploring that with 5e (it feels, at best, like a curiosity to them, but not one of significance).
If it doesn't focus on the fact that Athas is a brutal, harsh and unforgiving world, and support that with mechanics...then what would even be the point? It wouldn't be Athas then.