You threw a cat amongst the pigeons with this, but I agree with you.
Having reckoned with the death of all my childhood icons over the past few decades, It seems to me one tough but essential lesson everyone has to learn is that we’re all psychologically hard-wired to be heavily biased towards the first version of any media we ever experienced. The younger we were when we experienced it, the more biased we are now, and the more hostile we are to change of any sort. (Try visiting the original trilogy section of a Star Wars forum and you’ll see what I mean…)
While nostalgia on its own isn’t a bad thing, it can be a trap. Ultimately, too much loyalty to defunct material traps that particular media in the past, making it harder to introduce to new audiences and new generations.
I love Dark Sun. I especially love all the development that has gone into its history and geography since first edition. But I don’t love the prospect of it becoming too overdeveloped and too precious to allow players a chance to make their own heroic marks on the world. (MERP anyone?) It would bring me great joy to see it become a vibrant new setting in 5th edition, even if they have to make changes.
Hell, if we don’t like the changes, we’re DM’s aren’t we? Just fix them back!