well,how many mayors do we have now? 10? this will be 10 less cities to handle for the governors. maybe if ppl get more things to do / influence they will go for those jobs. being a mayor is a perfect job for someone not being able to participate in the chat but still wanting influence on the game.
we could also define "couties" with 3-5 cities for which the "lord mayor" will be able to define the queues if we do not get enough mayors. then we could define a province should hold 5-6 counties.
also, if we go up with the city-count to 12 or higher for provinces, this could still be handled even without mayor-input.
having 12 cities in 7 provinces with mayors will lead to 84 cities to be managed.