Hey, new player here. The reason I dislike always-evil-orcs does not effect my attitude towards Dark Sun. I dislike always-evil-orcs due to it being completely and entirely setting dependent, while Dark Sun is a setting. What happens on Dark Sun doesn't effect my table, but having orcs always be evil and/or stupid did.
I personally like Dark Sun, and don't think that the slavery, tyranny, and other difficult and wrong aspects of Dark Sun are an issue. It makes sense for a world where resources are scarce for warlords and slavery to emerge. If people don't like those aspects of the setting, they can always just not buy the book. It's different when the aspects of a setting are forced upon the core and base rules that I (and most other younger players) have an issue. I'm sure people will complain about those aspects if/when a Dark Sun book is announced, but these two scenarios aren't equivalents. Dark Sun doesn't effect your game and table unless you play there, but the rules for a race do.
(I cannot speak for the majority of new players, but if they approach this matter similarly to how I do, the backlash against a Dark Sun book should be minimal enough to not change anything overly significant about the setting.)