stealth_nsk
Deity
Yes, it's late game problem for all Civ games. Civ7 does better than previous games at least in military side where the game first creates interwoven civilizations during exploration settling and then throws them at each other in ideological conflict. What it needs is to have some way to make map interesting for peaceful play, without mini-games like archaeology or missionaries. But I don't think there's adequate solution for this.As things stand, 3rd age needs to make game around map interesting. It currently doesn't for most victories. You do an optional minigame for archeology, trade for the resources you need, and put your population into specialists. You only really engage with the map if you try to win a war. In Civ VI, you used to settle late game cities in unhospitable terrain, to access rich deposits of coal, oil or uranium, but "unhospitable terrain" isn't a thing in VII. So if the fourth era is really coming, it hopefully comes with overhaul across all eras and harsher terrain before modern.
Piracy could test the ground for some interesting concepts, though - military operations without full-scale war clearly could be a base for 4th age, but they also could find some place in modern.
