At this point I don't think any current company is an ideal Steward of D&D. They're all too small and too narrowly focused on their favored edition to represent the breadth and width of all editions of D&D, it's retro-clones and the fans.
No game company in the history of games has ever lived up to this standard you have set. Are you proposing a return to the zine-based rules-trading wargamer communities of the 1960s?
An odd statement given that my only known source of people who play 4e (or playtest 5e) is my desktop computer.
Okay, first of all, this thread is not about one's preference for any particular flavor of D&D -- the OP specifically stated that the question he was asking was intended to be edition-neutral. So we should all dial down the rhetoric.
That said, the one thing that I am completely unable to reconcile in my brain about the quick onset of D&D5 is that since D&D Encounters hit its stride last year or so, my FLGS is packed to the rafters every week with D&D4 players of all ages, genders, and races (I am not among them). I have /never/ seen such diversity at a D&D gathering short of GenCon, where the sample size is several orders of magnitude larger.
It /must/ be an isolated phenomenon, because if my local experience is any judge, abandoning D&D4 is a /critical/ error on WotC's part. The owner of the shop and I tried to run a table of the last Encounters season using D&D5, as recommended -- not a single taker outside my usual (tiny) playtest group.
Does ignoring the D&D4 community in favor of courting Pathfinder players make WotC a good steward? Would it make them a good steward if they buckled down and supported the D&D4 community to the exclusion of Pathfinder players?
The transition between editions of a game is always rough, but did the transition from D&D4 to D&D5 have to be as jarring as it has been? The content of the games aside, I can't feel like the transition was handled in a very "steward-like" fashion.
This is obviously an unfair criterion -- Paizo hasn't yet had to steward a major revision of their ruleset, while WotC has suffered through two very contentious transitions. D&D3.5 to Pathfinder was floated on a powerful wave of consumer rage. Without a D&D4 analogue to rally against, I doubt the transition to Pathfinder 2.0 will be as smooth.
Well, those are two things I do my darndest not to care about when conceiving a story: D&D lore, and the PCs.
BE CAREFUL! You're going to give Pemerton an aneurysm!