There I was trying to persuade myself to start Pride of Nations and live to see second turn again and I've thought: wait, isn't this game simultanious?
There was this game, Galactic Civilization 2, were they have simultanious turns. They made game multithreaded so AI thought about his turn while player made his. While player adds commands CPU is almost idle (let's imagine that in some games graphics are processed by GPU), so even on a single core PC you get AI that has everything figured out by the time player clicks end turn, so there's almost no waiting (except when player has nothing to do and he clicks end turn over and over again).
So what do you think? Is there any reason AGEOD games can't have such feature?