I really like the idea of a playable dark age

I like the transition ages and ur crisis changes

I wonder when we will get earth quakes and tsunamies as natural disasters.

No - Then Can't. Age transitions ARE the problem

The suggestions sound fun, but the age system is introduced so that units don’t get obsolete too quickly. I thought changing leaders was better than changing civs but the way you explained, changing civs makes a lot of sense and fun. The intermediate ages idea also sounds fun but I believe all these suggestions would make the game too complex and niche and it will become harder to attract new players imo.

No, and I specifically don't trust the current dev team to ever fix the game, since they showed that they had literally no clue at all what a disaster this game would be, when it was obvious to everyone else within 2 minutes of the first gameplay trailer.
This was confirmed when the game launched after months of the devs coping and it mysteriously flopped, just as most people with a working brain predicted.
They made this game in an echo chamber of toxic positivity and baked all the failure points into the core systems this entire game relies on.

The best thing they could do is apply the rule of thirds to their studio. Fire a third, fire a second third and fire a third third, then start over.

To point out how easy a Civ7 should have been, I would have been perfectly happy to buy Civ6 again, but running on a better engine that doesn't choke to death with too many assets loaded on a map.

I know Millenia was half-baked when it had the plug pulled by Paradox, but the way ages worked there was a real piece of innovation for the genre. Not this age transition bullshit that hard-locks mechanics when having earlier or later access could have been an interesting way to differentiate some civs.

I'm especially mad about the Exploration one, since the far lands bullshit is the poster child of what I mean up there with the devs having "baked all the failure points into the core systems". You literally can't fix this without ripping the entire game apart and starting new.

I remember when civ 7 just launched and I had reached the modern age and one of the main thoughts I had was the American colonies starting a war to become their own country. And even though I knew it wouldn't be a fun game mechanic to lose all the settlements you just spent the entire last age making. but this way actually fighting a war between your settlements would be pretty cool and could give players ways to mess with other players such as supporting the rebellion.

I think each player should get their own crisis based on their actions and strong suits for example a player who spent most of the age fighting others might have created a nationalistic people who want more war. This would make their people less happy for not being at war and capturing settlements. The result is either the empire collapses due to over reaching, or the people tear the empire down due to in fighting. If a player is doing really well in science their crisis can be dealing with religious pressures against science.

As for tech and culture I imagine these 3 age transitions to be sub ages   with their own trees that are different depending on what your crisis is afterall dealing with religious people trying to burn books because they are heretic requires different things than dealing with your distant land settlements trying to fight for freedom. Then again there is an argument to be made about giving the players all the options and letting them realize what they need to prioritize.

And lastly if this is going to be a more aggressive defensive time of play I think it should be optional like how civ 6 did the other game modes like barb clans or zombies.

Civ hasn't been great since Civ 3. 4 was ok, 5 was good and 6 was pure pants. I don't care from here on.

The game is fundamentally broken. By the time you've fixed it all, you have a new game. Having an expansion to bring the games era/tech up to where EVERY OTHER SINGLE CIV game has had it since civ 1 is not impressing me. Also, this who "space" expansion, I presume will be a static screen where you send missions off like the civ 6 spy missions. I don't mean to be hyper critical, but i've never disliked so many facets of a civ game before. I used to hate Civ 5 the most. But nope, 7 is the last jedi of civ.

I wish they would just stop making new civilization games. The first one or two was fun, now we are playing the same game with slightly different mechanics how many years later? tbh, if this was the first or maybe the second game, it might be worth playing. But you can only remake the same game so many times before every one starts asking what the point is. If you're not interested in it before, you're not going to be interested now.