I think the game I'd most like to see just involves mixing other aspects of other games
Set in Ancient Rome, everything is in First Person:
!) Born a peasant, join army. Start as foot soldier, This is a kind of mix between COD...just with Roman Weapons
You do this until you are promoted, you continue to get promoted for a while, gaining more and more responsibility via battle plans, first starting out leading like 4 soldiers, then 25, then 100 etc...until you are a general
3) Then you gain control of land, like as a gouverneur or something. Increase your land, find a wife, build your estate, manage your militia..
4) Maybe head a military coup?
Maybe you could even have kids, and switch characters to play as them, so the game just continues? I dunno the game would be massive but this is what I'd want. This is the game I've been waiting 10 years for.