I know military personnel try to defect sometimes, but I still don't know about entire cities defecting. Maybe they could add sometime of unit defection system and remove the city defection. The option of a city defecting is removed with a totalitarian government, but now you are faced with the chance of unit defection. City defection now applies only to 'free' governments. If a unit is produced in a city where 40% percent or more of the people are unhappy, each turn the unit has a chance of defecting. If it defects, 1 foreign population point is added to the nearest city with the most culture (the Civ the city belongs to must not be in the same type of opressive government as you). The chance of defection (the unit has no chances of defecting if less than 40% of the people are unhappy) could be something like 1:10. Chances increase when more than 40% of the people are unhappy in the city and during war. A unit may not have a chance of defection one turn, but may the next due to its 'home' city becoming 40% or more unhappy. A unit will now have to carry the name of the city it came from just so you can keep track of defection-city happiness. This is not bringing back the home city concept as in CivII. The unit leaving the city has no effect on happiness or production.
Any other thoughts?
Any other thoughts?