As of now I think there should just be one section for gaming discussion, then one for gaming market/services possibly inside it so you don't have to go to a different section. Have a more user friendly option for viewing and setting tags to search for specific games. And when a specific game or series is popular enough give it it's own section.
Although, I do have an idea on creating sub-forums for these games while still showing almost as prefixes in the main "Gaming Market". This will come with an overhaul of some forums, mainly the marketplace in general pretty soon.