I wouldn't mind, however, seeing a mythological spinoff building on Civ6's framework. They could use a mix of gods, demigods, and folk heroes as leaders for real civilizations (Gilgamesh can stay; bring in the Jade Emperor for China, Amaterasu for Japan, Quetzalcoatl for Aztec [doesn't even need a model change
vis-a-vis Monty

], etc.) and new mythical civilizations like Atlantis, Hy Brasil--even city-states like El Dorado. Could be fun, and it doesn't require Firaxis to create an original setting which will inevitably be bland.