If the hype about AI is true, then all of our thinking is moot.
Some pretty smart people are saying that AI will be writing the majority of code by next year. It seems plausible that Firaxis and other developers will be retooling their staff to push gaming forward quickly. Which might make it child's play to rework Civ 7 to be ageless and to add another era. Or two.
On the other hand, AI might just create new games that instantly make all that has come before irrelevant. If the transition happens then the calendar itself may change to 2025, 2026, AGI 0, AGI 1, AGI 2...
If the transition doesn't happen, well, a lot of very rich people have spent enormous sums to make it happen. So, we should see some pretty entertaining consequences either way.
Which basically means we probably ought not worry so much about one iteration of one computer game.