overgeeked
Open-World Sandbox
They're already crossing over. D&D books detailing MtG settings. MtG sets featuring D&D lore. It's already happening.About the IP's crossing over and beccoming one... I'll worry about it when and if it comes to that. No point in worrying about something that has not happened yet.
What would a full merger look like? All D&D lore added to MtG? All MtG lore added to D&D? They already did D&D with cards, I doubt they'll make that mistake again.
I'm doubtful we'll see Greyhawk. It's possible, of course, but I'm doubtful. There's just nothing much to differentiate it from any of the other generic kitchen-sink fantasy settings. Gritty realism, lower magic, and less superhero characters isn't really enough.This will probably be a setting we see soon. I expect Greyhawk to explore those variant rules heavily.