Continuing on the subject of WotC's publication record vs. Greyhawk...
Although not a setting book per se, we shouldn't forget that WotC also published two massive Greyhawk adventures for 3.0/3.5:
Return to the Temple of Elemental Evil
Expedition to the Ruins of Greyhawk
Before that they published a Greyhawk campaign book (
The Adventure Begins), a
Greyhawk Player's Guide, and several sourcebooks and modules for 2e between 1998-2000 (
The Scarlet Brotherhood,
Slavers,
The Doomgrinder,
The Crypt of Lyzandred the Mad,
The Star Cairns,
Return of the Eight, the
Return to the Tomb of Horrors boxed set,
Against the Giants: The Liberation of Geoff,
Return to White Plume Mountain, and
Return to the Keep on the Border Lands).
As recently as 2013, WotC compiled/expanded/re-issued the original
Against the Slave Lords series of modules for 1e (yes, for 1e). That's only 1 year before the 5e core books came out.
So while Greyhawk may face a competitive disadvantage in terms of setting identity/distinctiveness vs. the more recent settings, I still think there's a good possibility that WotC will release new Greyhawk material in 2024.
Things I can see them releasing:
. a limited edition reprint of the 1983 boxed set;
. an updated Descent into the Depths of the Earth/Vault of the Drow/Queen of the Demonweb Pits combined with a mini gazetteer expanding the southwestern Flanaess beyond what was presented in Ghosts of Saltmarsh (easily converted to FR);
. a City of Greyhawk book combined with a selection of short adventures (easily renamed and plopped into other settings);
. a compilation of previously published adventures from Dungeon Mag set in Greyhawk;
. or an updated campaign book
It is worth noting that the comprehensive
Living Greyhawk Gazetteer, was essentially
edition neutral and focused on history, races, politics, geography, religion/gods, adventure hooks, and power players/influential organizations, with a full colour pull-out map;
whenever it mentioned NPCs, they were given a race, alignment and level, and nothing else (much as was the case with the original Folio/1983 boxed set).
I still think the Living Greyhawk Gazetteer is the best campaign book TSR/WotC have ever released regardless of setting, and I love its edition neutral design (giving DMs plenty of room to maneuver... I realize that will not be to everyone's taste). Not sure how people would react to an essentially edition neutral WotC product in 2021...
That may not be much of a full setting "pitch" in itself, but I still think there are ways for WotC to turn a profit releasing material that is implicitly, if not explicitly Greyhawk (as they did with Ghosts of Saltmarsh and Tales from the Yawning Portal).