against a common threat ? of course they will, especially if it's imminent.But is that REALISTIC? I don't think civs will ever unite... unless you make them
They may start to compete again over influence/resources as soon as the threat is over, but they do unite until then.
There even was a proposal of a Franco-British union (as in same nation with the same constitution, so not something temporary here) during WWII at the moment of the fall or France. An union, between France and Great Britain, knowing the past history between those two nations... If they could even think of proposing it, nothing would be unrealistic in game.
Problem for the game design is that to have meaningful cooperation, you need to rework the victory types, and allow more than 2 players alliances, not something I think they can do for civ6, even if there is another season pass IMO.
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