Dungeonosophy
Legend
What happens if WotC wants a "Kara-Tur" for the world of Greyhawk?
Already there: the Celestial Imperium, Nippon, and the Nippon Dominion.
https://greyhawkery.blogspot.com/2012/04/beyond-flanaess-importance.html
Bringing out the connections between all the D&D Worlds doesn't preclude the further development of the hitherto unknown continents on each world. In fact, the proposed Tasslehoff's Atlas of the D&D Multiverse would feature newly "canonical" world maps for all the D&D Worlds, showing the location and shape of all continents, on both hemispheres. Even for planets which we don't have complete world maps for yet (e.g. the planet of Io's Blood, the setting for the 2E Council of Wyrms campaign setting), and for a bunch of Spelljammer worlds. I suspect people would be really into it.
Furthermore, this Atlas would show "canonical" locations for *every* D&D module, novel, and video game ever produced by TSR or WotC. (Kind of like the map from the Classic D&D Expert Set blue box which had an icon showing where all of the published Basic and Expert adventures were located in the Known World.)
Several adventure sites would be located in more than world (e.g. Keep on the Borderlands in Oerth, Mystara, and Nerath). And questionable sub-settings which haven't been placed before (Thunder Rift, Kingdom of Ghyr, Karawenn, Arir, Kolhapur, the D&D choose-your-own-adventure gamebook world) would be placed *somewhere*. Perhaps there'd need to be a new "Generic D&D World" which receives all of the generic stuff that doesn't fit anywhere else.
This is doable.