Alright you clueless lot, listen up!
Them high up men at Wizards are sitting on a pile of untapped jink and I don't believe they're complete leatherheads, but I can't see why they aren't taking advantage of this.
So they've reprinted old editions and made available PDFs of modules and accessories, what are they missing? Campaign settings! Those old, glorious box sets that bring the worlds to life and set many a DM's mind alight.
Now, all one of those bloods has to do is look at an old box set (let us say, the planescape campaign setting) and do one or all of three things...
1) add those books: player's guide , dm guide to the planes, monster compendium and Sigil and beyond as PDFs to dndclassics.
2) combine the Sigil and beyond, monster compendium and the dm guide to the planes into one hard back, with the maps in the back (like the third edition campaign setting) and have the players guide in a soft back (similar to the 32 page pathfinder player guides).
3) do a glorious, premium reprint of the box set, as was but brand spanking new.
there will be a few outsiders who will accuse wizards of being cross trading knights, "charging jink for old rope". To them, I say, "pike it berk!" Those sods clearly don't know the dark of d&d.
Now, who's palms does a body have to garnish to make this happen?