Playing civ 2 I remember when your empire would eventually have a civil war, I definitely think the rebellion aspect isn't as prevalent now though it should be. I definitely think most players would welcome the possibility of having more rebellions if your happiness isn't in order, I think @Trav'ling Canuck brought up the happiness aspect before in Civ 6. It should be much tougher to keep your cities happy. I also really miss seeing fireworks for "We Love the X" day. This seems like the logical way for the game to continue, after exploring the map possibilities it would be great to have another look at the internal mechanics of your empire. On another note - I really think the government plaza's loyalty bonus doesn't need to be there, and it should instead provide a more unique aspect. I've never come to think of it as a source of loyalty, why not expand on it further by giving it some unique interaction, like a special bonus when a governor is stationed there? Overall the government mechanics really need to be examined again I think.