The only decent rts game in my opinion is BftB and the other game sin the Panther series...all the others do nothing for me...loved CC in it's day but I went back and wasn't to impressed
Just remembered another damn fine rts game Achtung Panzer
Neither of these are RTS.
RTS = a dumbed down strategic game in real time like DuneII, Command & Conquer and Age of Empires. The name RTS wasn't used before Dune II. Even more modern "RTS" like Company of Heroes and Dawn of War are hardly RTS as combat is placed on tactical-level and there are squads instead of nondescript units - they are more like an attempt of creating a tactical game by someone who has never played a tactical game in his life and decided to make RTS more "realistic" without realising that RTS are strategic games and that real time tactical games existed since a long time.
True real time wargames were called real time simulations since 80s. So, games like BftB, CC, Armored Brigade, Firefights, are real time simulations (RTSim?) not RTS.
So you're looking at something of a grander scale.
Hearts of Iron fits your description. Real time, strategic in scope with resources, production and diplomacy.
But is it realistic? What is your definition of realistic? At least it's more realisitic than Age of Empires, Rise of Nations, etc.
So, someone already had this idea? It's a grand strategy game, though, not a strategy.
People shouldn't ask themselves why schools get shoot up.
They should ask themselves why people who finish schools burned out due to mobbing aren't receiving high enough compensations to not seek vengeance.