in theory it sounds good. but think on how it will effect game play.
the map would be clutered with cities. ( you would have the old problem of dozens of units in a provence, but now it would be cities, which you need to build your empire)
emagine having to protect all those cities from raids. you would have to double or triple your forces, (depending on the number of cities). then you have to think about their loyalty , and the cities.
think of the trade system.
it would be worse then victoria. play that game and you will see why more != better.
if you add more cities than a single campaign will take months to complete.
and that takes the replay value out of the game. I personaly would not want to start a new campaign knowing that it would take a month to complete.