While I agree that WotC has moved into a position in the market that will result them making products that might no longer appeal to 'older' D&D fans (they already have from my perspective). And we should look at others to fill in the gaps.
Your premise is a bit faulty, because others insist that WotC MUST make a product that they know, beyond a shadow of a doubt, will make other people unhappy! In the same way TSR ignored the people making the D&D=devilworship, WotC is now listening to other parts of society...
There is a notable difference. This allusion to the Satanic Panic keeps making the rounds like it’s some sort of slam dunk argument.
Those promoting the satanic panic were not and never were going to be part of the hobby or the fandom. These were people, woefully misinformed, promoting a big pack of false information in order to force people who had nothing to do with them, to follow their beliefs.
In this case, it’s actual fans of the hobby, who support the hobby with both time and money, telling you that including slavery, one of the most evil bits of our shared history, the effects of which we are still dealing with today, is not something we want to see in our pretend elf game. We don’t want this product and we won’t buy it.
There really isn’t much of a comparison here. You are being told, quite honestly, that things like slavery make people in the hobby, who are every bit as important to the hobby as you, make us uncomfortable and feel unwelcome.
So, at the end of the day, which is more important to you? To me, it’s more important that people feel welcome in the hobby. I don’t need a thirty year old setting to get reprinted knowing that that reprint is going to make others in the hobby feel like they’re not welcome.
We’ve done that quite enough throughout the history of the hobby.
You want Dark Sun? It’s all right there in pdf format. Every bit of published material for your enjoyment. But I do t feel that it is appropriate for WotC to actively support that line knowing that it will make chunks of the fandom unhappy.