Huh. In spite of all the hate here for Forgotten Realms, Wizards must be doing something right. Almost like people who frequent forums aren't the center of the RPG world. Weird.
I apologize if my suggestion for Greyhawk came off as FR-hate. A very large (huge) chunk of my gaming shelf contains numerous Forgotten Realms box sets, modules, and adventures spanning 1st, 2nd, 3.0/3.5, and of course 5th.
It has never been suggested that we who post on forums "are the center of the RPG world", but I can speak from experience that I have had personal conversations on these forums with individuals working with and in-charge of Adventurer's League and other developers from other publishing companies. I think it might be safe to assume that WoTC employees may be peaking in from time to time here. If they are, than throwing out a suggestion that may just open the D&D Multiverse (you know .... the default setting of 5th Edition) a little bit more, isn't such a bad idea.
I never suggested to completely end the Realms, but there are tons of storylines to write! One and done books (licensed properly) wouldn't hurt. Suggestions:
1- Mordenkainen is trapped in Ravenloft during CoS. Once word got out on Oerth that he was nowhere to be found .... how has Iuz reacted? What about the Scarlet Brotherhood? Have the current members of The Circle of Eight been able to maintain the balance with their leader missing? With Elemental Evil's failure in Faerun, it would make sense for it to turn it's attention back to Oerth since Mordenkainen isn't there.
2- Remathilis suggested a Planescape adventure book because one could come and go a lot easier than you can from Ravenloft. Are we sure? After what Vecna pulled at the end of 2nd Edition, I think it's safe to assume The Lady of Pain is more watchful of who comes and goes from Sigil and her punishment is probably more severe for even the lowest transgressions (all this to make sure no one tries what Vecna pulled again).
3- Dragonlance wouldn't be a bad place to update either. I've only seen a few comment positively about Krynn on here, but at the end of 3.5 .... Krynn was left in pretty good shape. Takhisis is dead, Paladine walks the land, and pretty much every big name hero/villain is either dead or powerless. The world is ready for PC's to make their mark because there is literally no one left to save the world from the next big threat. Plus, they already updated the Krynn Minotaurs in a Unearthed Arcana.
Again, sorry if my suggestions come off as Realms-hate. I don't hate the Realms .... but I do love the D&D Multiverse more.