Celebrim said:
If you look at his own body of work - Desert of Desolation, Ravenloft, Dragon Lance - it is remarkably unoccult and culturally neutral fantasy while still being I think quite obviously deeply influential examples of the craft of adventure creation and mature thoughtful works. I wonder which is really the more valuable intellectual property - Orcus or Dragon Lance? What value is having Belial in the game compared to say Strahd?
Orcus or Dragonlance--which is more valuable? I don't think that's nearly as strong a point as you want it to be. Dragonlance is undeniably stronger as a novel series, but as an RPG theme, i think that's murkier.
WotC is releasing an Orcus mini in its D&D Icons series--I haven't seen any DL minis in the Icon series, though several have been featured in other minis. Orcus (and certainly D&D Demons and Devils as a whole) feature larger in WotC products than DL in 3.x edition. DL just got one book from WotC (and some support in Dragon magazine).
Demon Lords and Archdevils have been in the D&D game from the beginning, and are clearly being embraced in future products. DL probably has a future still in the D&D game, but other than the occasional release of a DL mini, it's very unclear what RPG support DL is going to get.
That doesn't mean DL isn't a valuable property--it is, but it's clearly far easier to cash in on that property by releasing novels rather than RPG support.
I think Ravenloft is a similar case. Ravenloft got one book of support from WotC, as far as I remember, during 3rd edition, plus the Strahd mini. Clearly Ravenloft is a valuable property. But I could see Ravenloft being dropped completely from D&D products (at least temporarily) far more easily that dropping the famous Demon Lords or Archdevils.
Ultimately I think Orcus is at least as, if not more,integrated into D&D consciousness as Dragonlance, and definitely more than Ravenloft.