I have a suggestion for a Civilization style game. It would combine the genres of strategy, wargame, action, adventure, simulation, interactive movie and role playing. How about a more complex tech-tree, more units wonders and more. How about a multiple storylines that are different for each of the major civilizations.
Techology levels would cover the 8000 B. C. - 2100 A.D. Summerian/Egyptian/Greek periods, Roman Empire, Byzantine Empire, Dark Ages, Middle Ages, High Middle Ages, Medieval Europe and Japan, Renaissance, Reformation, Elizabethian era, Spanish Empire, Inca and Aztec Empires, Jacobite era, Barque era, Age of Discovery, Enlightenment era, Industrial Revolution, Napoleonic era, Romantic era, Victorian era, Edwardian era, American Civil War era, Old West era, British Empire era, World War 1 era, World War 11 era, Korean War era, Vietnam War era, Cold War era, Gulf War era, Futuristic Space era and more. Which would make it more Civ 2 and Age of Empires with all the units. You can have a Ancient Egyptian palace, Roman palace, Byzantine palace, Japanese/Chinese palace, Aztec/Inca palace, Medieval palace, Turkish palace, Renaissance palace, Baroque palace, Enlightenment palace, Napoleonic palace, Czarist palace and much more.You can choose if you want to be a god or mortal. If you are a mortal you have only a limited time period to rule and you can be killed. If you are a god you can live forever and have god like powers like creating disasters, plagues, destroying non believers and more.