The only problem I have with the approach WotC takes to their settings at the moment is that no one can use Greyhawk or Dark Sun for products on the DMs guild. You can sell an elaborate guide for running an old series of Greyhawk modules in 5e FR, but you can't sell a guide for running that same series in its native region under the current game edition. I know there are folks out there like GreyhawkGrognard that have a bunch of content ready to go for the DMs guild store if they'd just set aside their apparent fanatical devotion to Drizzitland.
I don't actually want them to publish official content for Greyhawk, really. I have a concern that if they did, they'd eventually and inevitably turn it into the Forgotten Realms, which would be a shame. There are people out there, however, who could turn a tidy profit for themselves and for WotC by providing gazetteers, expansion levels, conversion notes, etc. for people's favorite settings, and at the moment they're being shut out (unless their favorite setting is the FR.) It's one thing to pick a generic setting as the default for all your published adventures, its quite another to prohibit everyone else from using any other setting in content they put up for sale on the DMs guild site.
