Dark Sun is a lot like Star Wars to me: sometimes the ideas are better than the actual results. I love what the settings and stories imply. But I have been disappointed at times when it comes to the products that are attempting to present those ideas. I feel like Dark Sun would not be a very good fit for 5e. At least, not for the kind of experience I would want.
And it's not just because of the rule set. Dark Sun has always been filled with inconsistencies between what it promises and what it delivers. A world where magic is highly feared, restricted by powerful beings, and destructive to the ecosystem, yet there are more rules and options for spells and casters in every edition? Seems contradictory to me. What is on the package isn't what is in the product.
I could go on with a number of similar issues, but that is not the topic for this poll. I would not likely purchase a Dark Sun product for 5e unless it looked really good to me. In order to have any appeal, I would need to see some real effort to make the setting unique and delivering on its implied promises, not just shoehorn ideas and make tweaks to preserve the integrity of the system that the setting was designed to defile.