Look, I looove Dark Sun, and I own a bunch of the original run, and if i had my way WotC would release a 300p hardback 5e Dark Sun players' guide, then another 300 page GMs guide, then a 900 page megacampaign book that would be a sandbox that let the PCs re-enact the prism pentad in their own way, with them as the protagonists. But there's a hell of a lot of hindsight romanticism about how good the original run was. Even purely from a lore point of view, disregarding game mechanics. Even in the 2e source material, the sorcerer-kings whenever they appear (which is arguably too often - and people complained that FR had too much interference from high-level NPCs, these guys are in damn near every module and somehow avoid ever just crushing the PCs like bugs) are the cartooniest of moustache-twirling villains, simultaneously enormously powerful and utter idiots. The whole world is desert - except the amazingly fertile forests in the ringing mountains and the vast expanse of grasslands out west, which for some reason the most powerful beings in the setting never bother to move into and take over, preferring to build cities in the middle of the harshest desert on the planet. Why?
And that's not even mentioning the old sore points like how the very first novel series in the setting had NPC heroes solve all the big mysteries and kill all the big bad guys and generally blow the place up, and how the first tranche of modules were your PCs following along in their footsteps watching them do it. Or the biotech halflings. Or the surfing druids. Or the ... mixed messages about how easy/possible planar travel was or wasn't, or Athas' relationship to the 'default' planes in general (with implications for stuff like summoning spells etc)
What I'm trying to say .. is that Dark Sun was messed up already but it was still awesome. We all have our own mental image of the setting that edits out all the dumb stuff and is pure unalloyed headbanging fist-in-the-air brilliance. I certainly do. Mine is a mix of the original box, the 4e book, Lynn Abbey's RaFoaDK, and a bunch of other stuff that only exists in my head, like the other unknown sorcerer-kings on other continents, and with stuff like the Kreen grasslands and the githyanki invasion edited quietly out. But we have to remember our personal versions exist because they correct the messed-up bits in TSR's DS. Did anyone REALLY use all of the original 2e DS as written without editing to taste? And is there any reason we can't do the same again in 5e? A 5e DS would also have its inevitable derp moments, because every rpg product in the history of the world does. But ... a bit of faith, i think. Just cos it's old doesn't mean it's always great, and just cos it's new doesn't mean it'll automatically suck.