4G language? Damocles made a RTS game once called wastelands. Never finished AFAIK, but it's definitely possible.
4GL, I'm thinking dragon drops - Drag-n-drop. surely in this day and age a powerful game engine has been developed to just drag in most major components into a game, with a small amount of prgramming to blend everything together, to the creators desire. Sounds do-able to me. Most RTS need maps, menus, intro screen, AI, meshes, animations, sprites etc all of these are currently available and could be components that could be dropable in an engine.
