With the upcoming City-State "Grand Companies (GC)" coming up.. I think it would be a good time to look at allowing players to migrate cities.
I do not want to be a 'well, like in ffxi' person, but I think it is fair to say that there are a decent number of people that may regret their starting city-state choices, or may be more interested in another city-states "GC". Or also, they could complete a Cities main quest-line and want to participate in another.
(I need to note also, that I am going on the assumption 'like xi' you can participate in your starting Cities rank missions alone unless you migrate and start over in a new city, If I am wrong on this, then my point is still valid on the basis of the main scenario should you want to start over or do a different cities main storyline / change loyalties)
Having said this, there should be some limitations.
-There should be a migration fee
-There should be a cool down timer for migrating (once a week, once a month, etc)
-I'm open to the character may even needing to meet a certain Rank requirement to do so
Feel free to add opinions as to yes/no format, and any other restrictions they feel are reasonable to such an addition.