Jump to future - TW was always better with melee than ranged, so bring on the Jedi and xenomorphic death machines, and a sci-fi twist opens up some seriously fun options. Then again, it could be too many options and lack the historical grounding that previous games have had. The again again, the more awesome historical periods have already largely been nailed. Maybe fantasy? The Total War engine would be AMAZING for a Wahammer Fantasy game! *hint hint, Games Workshop and Creative*
WW1 could work - sufficiently different from Empire, but not completely ranged-centric. Tech tree building through artillery technologies, chemical warfare, development of machine guns, early SMGs being the be-all end-all infantry weapon, small scope for cavalry, eventual development of early tanks, static defences - would require significant reworking of infantry AI, early airforces, naval warfare... man, WW1 would actually be a pretty good TW game after all!
WW1 could work - sufficiently different from Empire, but not completely ranged-centric. Tech tree building through artillery technologies, chemical warfare, development of machine guns, early SMGs being the be-all end-all infantry weapon, small scope for cavalry, eventual development of early tanks, static defences - would require significant reworking of infantry AI, early airforces, naval warfare... man, WW1 would actually be a pretty good TW game after all!