Aristos
Lightseeker
The ideology system is OK (and a first in the series), but if we want to speculate on how to make it better, we can draw from previous/different experiences. HOI3 has a nice "triangular" system where the vertices are the three "opposing" ideologies; each country moves inside the triangle according to some diplomatic actions and decisions/sliders, until it is clearly identified with one of the vertices (not necessarily on top, but close enough). Once it's there, it can be part of the "Big Alliance" that corresponds to the ideology.
Second, GalCiv2 has a very interesting approach, again with three "moral" stances (very similar to ideologies in effect), represented by a line, where the extremes are "Good" or "Evil" and the center part is Neutral. Each civilization moves on the line according to diplomatic actions and decisions to events in game, and when a specific technology is researched, the civ has to "take a stance" and decide which of the three it will be; interestingly enough, it can choose any of the three, but the cost to adopt the choice will be proportional to how far it moved from the actions/decisions.
A mix of those two could be interesting to see in civ5. Key element: actions and diplomatic decisions "move" the civ closer to one of the ideologies; not a one-time choice anymore, but depending on in game actions. Could also be similar to GalCiv2, where the civ can choose any of the three, but the cost in culture would depend on how far the civ moved from the chosen ideology.
Second, GalCiv2 has a very interesting approach, again with three "moral" stances (very similar to ideologies in effect), represented by a line, where the extremes are "Good" or "Evil" and the center part is Neutral. Each civilization moves on the line according to diplomatic actions and decisions to events in game, and when a specific technology is researched, the civ has to "take a stance" and decide which of the three it will be; interestingly enough, it can choose any of the three, but the cost to adopt the choice will be proportional to how far it moved from the actions/decisions.
A mix of those two could be interesting to see in civ5. Key element: actions and diplomatic decisions "move" the civ closer to one of the ideologies; not a one-time choice anymore, but depending on in game actions. Could also be similar to GalCiv2, where the civ can choose any of the three, but the cost in culture would depend on how far the civ moved from the chosen ideology.