With the patch version 1.0.5e I have started a new test campaign to see how good the balancing is now. No faction was completely wiped out over the year 1100, which is quite advantageous. There was always at least one city of the faction left, which gives the player the freedom to support them to rebuild.
However, all the factions in the middle of the map at the end of the game have only one city left. This is probably simply because they are in the middle of the map.
Year 1084
Year 1090
Year 1095
Year 1100