I do agree that the current COD leaves something to be desired regarding inspiration. The franchise has become formulaic and is at risk of stagnating.
When it comes to potential ideas for a new direction. I'm not too concerned as you can make anything work.. historic, modern, futuristic. What I would like to see are key updates to the engine itself. A major push into physics for example would be interesting...
- Fully destructible objects and environments - advanced and improved over BC2
- Advanced dynamic animation system - perhaps integrating AI
- Positional audio (using RT)
- True evolving battlefield - the place should look completely different after each engagement
- Weather system to help keep maps fresh i.e. storm, sunny, snow, rain etc.
- Cool new multiplayer modes - perhaps one where you can only be respawned if a teammate can carry your unconscious body to safety
- Perhaps some maps based upon realistic locations depending on the setting
- How about a shooting styles system for extra experience in matches, kinda like showboating
There is so much more that they could do.