Zardnaar
Legend
I love Dark Sun. After Ravenloft, my favourite official setting. One of the reasons i like it it's cause it so much different than other settings. Like someone said, practically game of it's own with 2ed d&d base mechanics.
And if it were ever updated, i would buy it in a heartbeat. Not for the fluff, that i can do myself and use old DS materials (although, i'm not above using fluff that i like), but for the crunch. Converting old 2ed crunch to 5ed one is PIA work i would rather pay someone else to do.
Assuming they didn't screw up the crunch that's what I would do.
I don't think 5E is good for Darksun though. To much Magic, psionics there's lots of third party and healing to easy.
Square peg, round hole.
2E DS is a bit of a pita to run due to required materials nowadays. Players don't care that much about psionics either.