I believe the requirement of having ten cities to select a king is unnecessary and hinders smaller kingdoms from competing with larger ones.
In older servers like Moon Garden where I'm currently in, Skarn has 12 cities except 6 of the 12 are inactive and prevents us from selecting a king. Now you might say the solution is to get active players to capture more cities, except we don't have enough active players to hold cities. Other small kingdoms in this server have the same issue with king selection. I'm almost certain this is issue applies to smaller kingdoms in other old servers.
It is unfair to active players and widens the gaps between smaller and larger kingdoms even more. The boosts given to king and council are immense. Larger kingdoms already have possession of more cities, more resource boosts, special districts, mines, and dungeons. I hope smaller kingdoms get some sort of comeback mechanic to grow. At the very least, allow the player with the most votes to become king so every kingdom may have a king and council.