Thanks for the Eberron examples that explicitly support DM crafting of the setting. That's starting to go in the direction I'm aiming for.
I think if there are going to be world-building tools for D&D Next, that is great. But there should be significant support for a core setting (be it Greyhawk, FR, etc.) to help out fledgling DMs to at least give them a place to start and (more importantly) to show them what a well-developed setting looks like to spur their imagination.
This is where I differ. Thrust of my OP is that there ought to be
no Core setting whatsover in D&D Next. Instead, from the start, the default would be a make-your-own setting pieced together from the offered selection of 5e dungeons, various sample D&D deities, etc.
Just as the default world of 3e was Oerth, but of course many DMs used other published settings or homebrew settings, and just as the 4e default world is Nerath, but with many DMs using other published settings or homebrewing--Likewise, though many DMs will use a published setting, the
default in 5e would be a nameless world that DMs are expected to name and piece together as they go. Just as 3e and 4e gave one name for the Core default world--"Oerth" and "Nerath"--so will 5e give a table of sample syllables or principles for naming, so that each DMs names their own. So the default 5e world will be named differently by each DM: "Noerth", "Naerth, "Yearth", "Erstara", "Athynis", "Urath", "Toras", "Ueril, "Abeith", "Yrd", etc.
Yet all D&D Worlds will continue to be supported. The less popular Worlds would only a dedicated page at the WotC website, containing for-fee PDFs of all materials ever released for that world (sourcebook, adventures, magazine adn web articles, novels, comic books, etc.), and perhaps an occasional Dragon magazine article. The more popular Worlds, such as Eberron, Forgotten Realms, and Greyhawk would have new 5e print products. But these would not be Core worlds. These would be cohesive Sourcebooks, but would be presented as Campaign Models to be kit-bashed.
Travis