I've always wondered about new ways to play a game, and how such things would be done. One that has bugged me for a long while is Real-Time Strategy games with an optional First-Person Shooter implication.
I believe this would be an outstanding concept if adopted by the right companies. Some have tried slightly (Savage: Battle for Newearth, or something like that), but I haven't really seen anything matching my image.
I've always thought of a game like Command and Conquer mixed with Battlefield. Specifically, Command and Conquer: Generals combined with Battlefield 2. This would give players the strategic side of the game as well as the ability to completely immersify themselves into the battles.
Now I just wonder if there is a company strong enough to handle such a task...