The Cosmic Kid
Warlord
Reposting an idea I had in another thread:
...the Civ4 cultural victory is really counterintuitive: building a wonder in any city except your three culture supercenters is a major opportunity cost, and to be avoided if at all possible. And conversely, building Hollywood in a city that's already going to hit legendary turns before the other two was also a waste. The game needs to find a balanced way to reward all cultural achievement, just as the space race victory rewards all scientific progress and production. I haven't played CivRev, but its "20 cultural events" version of the cultural victory sounds like it would do the trick.
Or, for something a little deeper, imagine an adjustment to the culture system: your cities spread your civilization's culture into all foreign cities they're trading partners with, in amounts depending on their overall cultural output of course. This could serve as a simple replacement for espionage: the more of your culture is in a foreign city relative to its native culture, the more you can see about that city. Also, the city's war weariness against you would be higher, and perhaps a "reverse war weariness" could produce happiness when diplomatic relations between the two civs are good. (I'm not sure this is entirely realistic: look at attitudes toward America in the modern world, either despite or because of America's cultural hegemony. But it's intuitive, and rewards good play.) Cultural victory is achieved when your culture is stronger in each other player's territory than their own - specific metric to be determined.
Since this mechanic works through trade routes, it encourages exploration and trade agreements. No longer can you sit on an isolated island and somehow dominate world culture without ever meeting another civilization! (Yes, I've done this.) In fact, I can even see this form of cultural victory subsuming the diplomatic victory, which would neatly kill two birds with one stone, since the current diplomatic victory system is also horrible. The diplomacy-culture exchange could work both ways: foreign citizens like you more the more of your culture is in their city, and your culture spreads more effectively the more those citizens like you. And the new United Nations might, oh, cause all foreign cultural spread in your cities to be automatically returned in kind.
So that's my brainstorm. I'm sure there's plenty of room for improvement, but I think it's at least the kernel of a good idea.
EDIT: Imagine oppressive forms of government are more effective at stifling the spread of foreign culture - perhaps even providing options for removing that culture. This would make the propagation of liberal values through diplomacy a natural means to the end of cultural victory.