Dragonflight's goal is "a return to Azeroth," bringing more grounded themes and getting us away from the endless existential nightmares. I think a tech-themed expansion could serve the purpose just as well as Dragonflight. This also has the potential to introduce some sort of Tinker (engineer, machinist) class to the game, which I believe a better fit for the ranged only, mail-wearing class design intention. Also, the Undermine and possible underworld of Azeroth, in both a metaphorical and literal sense. Criminals and caves, technologies and trade, Titan facilities, Old Gods, Azerite, Nerubians, Drog'bar, the Black Dragonflight for all you dragon nerds, Earth elementals and let's not forget: Goblins and Gnomes and all the zaniness those two races bring with them.
Anyone with me here?