Yeah, I don't think I could tolerate a third futuristic game on the spin. This franchise used to ooze diversity but now it just seems to be all this fantasy nonsense created by the devs portrayals rather than focusing on a specific era which people can relate to.
Going back to the typical World War setting may upset the younger quickscoping noob-tubing generation which COD seems to be in-tune with in recent years but I still believe they can design a spectacular FPS game with classic hallmarks brought into today's generation of consoles. Treyarch only let me down with their shitty connections but their design and community relationship is usually spot-on and they know what they gamer is looking for so I have complete faith if they go this way.