Are there any civic buildings that anyone thinks really need to obsolete? As I said elsewhere, I think that the functional obsolescence of a civic is enough of a check on civic buildings that the buildings don't need to go obsolete on their own via techs. Agora is the only one that seems strong, and I think in that case we should scale it down a little. Otherwise, it isn't really a negative if you can't build the building due to civics long before it goes obsolete due to tech.
The one thing that I would like to do is create an upgrade chain from Polis Council to District Office/Provincial Hall (increasing both of their maintenance reductions by 5%) and then having District Office/Provincial Hall upgrade to Voting Link. Polis Council and Voting Link are Rule civic buildings, while District Office/Provincial Hall are Government civic buildings.