My point - primarily in reply to
@Lanefan - is that commercial publishing houses will act as commercial publishing houses.
The days when TSR or WotC would publish something because
it demands to be published were gone, in the former case, probably by the early 80s, and in the latter case, by the time they purchased TSR and possibly before.
That's before we even get to the question
what would it mean to be a custodian of D&D? That can't possibly mean, as
@Lanefan asserted, continuing to publish modules for Moldvay Basic. Even if there are things that
demand to be published regardless of their commercial prospects, those would not be such things.