Demetrios1453
Legend
Eberron and Dark Sun, for all they might have going for them, are undeniably niche settings - as are Planescape, Spelljammer, Ravenloft, and some others. And niche settings have a big built-in strike against them: the potential market, and thus potential profit, for each is much smaller than for any generic setting.
I do have to disagree here when it comes to Planescape, since the Great Wheel is back for 5e and well described in the PHB and DMG. Other than the fluff (factions, planar cant, etc.), it's already pretty much baked into the game for this edition, and it would take fairly minimal updating to get even that missing fluff in. In fact, I wouldn't be surprised if we see a Planescape adventure path (given that we've been told to look for hints in the core books, likely a riff on the Great Modron March) and matching accessory book (although probably not a traditional Manual of the Planes given the format of 5e accessory books) in the next year or two...
Given that Dungeonology specifically pointed out Acererak, I'm wondering if we shouldn't be looking for hints there as well. Sigil and Greyhawk are both given some detail, so I'm beginning to thing that both of them will be featured in upcoming products...
Last edited: