I'm very interested in what gameplay mechanics would exist in a cold war through information age block of time for a Civ VII age, but as has been said before, the roster of civilizations would be dreadful. Even besides the fact that Firaxis has historically avoided polities and leaders from too recent history, the possible roster isn't as interesting to me as historical civs. Any truly interesting one would also fit fine in the Modern Age as we know it now. Have both the Russian Empire and the Soviet Union in the same age, I think that's fine.
Decolonization would be an interesting mechanic, but not if I'm just suddenly playing as a decolonized civ. I like the idea of playing in ideological blocs, but it does run the risk of going against the spirit of the game. I love the idea of MAD mechanics, like automating nuke targets in case you get targeted in a first strike, but I'm not sure that's actually compelling gameplay. All of that is workshopable, though. There's something good there, I just don't know how Civ would capture it.
Decolonization would be an interesting mechanic, but not if I'm just suddenly playing as a decolonized civ. I like the idea of playing in ideological blocs, but it does run the risk of going against the spirit of the game. I love the idea of MAD mechanics, like automating nuke targets in case you get targeted in a first strike, but I'm not sure that's actually compelling gameplay. All of that is workshopable, though. There's something good there, I just don't know how Civ would capture it.