Can we make earth somewhat kinda towards like utopia to keep the strats evolving and interesting. And a slight gain in production when having a high % of one type of building. This will involve everyone in using the market instead of having 1/3 of countries running rainbow strats. What made this game interesting is the public market and i think we should exploit it to make it even better.
For example, add something like personality on top of it or have a the government bonuses slightly change every set. This will keep more players on their toes so it won't be as redundant.
The more variables, the more fun and interesting the game becomes. We can even have a special unit or special ability for each government. Like communism can do propaganda while others can't.

We don't have to make a different version of utopia but I just think more variables in the game will definitely create a lot more interest. I honestly think the reason why utopia was more popular simply because there's so many variations plus it forced interactivity.