No rule is inviolate
I pray not. Dark Sun is..dark. It is gritty. It isn't politically correct or light hearted or fair. The lines between good and evil are blurred. Genocide occurred. Many mysteries (e.g. what happened to dwarves and elves) are left unexplained, leaving the world enigmatic. Survival is often its own reward. Heroes are rarer than metal, for the people don't have a glorious afterlife. When you die, you simply fade away. Because it was dramatically different, it was awesome.I imagine it will look a lot like it did in 4th Ed but continue to evolve
Take all that away, homogenize it, bring in tieflings and gnomes and other eradicated races, allow every class, tone down the slavery and the hopelessness and afterlife and so on, make defiling a minor mechanic, and the setting simply becomes a desert. Might as well do Forgotten Realms. It has a desert too.
Not saying you're wrong. You're probably exactly on the right path for what WOTC is thinking. I just hope not. It'd be a slap in the face to something unique and special, and I'd rather they just let it rest in peace. And that's the thing that is attractive about it. I made a DS 5E conversion, true as I could to the original. I ran it for players who didn't know what it was. We used a 3rd party psionic book. We had advanced defiling rules. And, it rocked. It was something they'd never seen before. They'd seen the Realms and the PHB and all the default stuff. But, not this. Not these choices. It was a refreshing change of pace, for everyone.