That's a nice idea, indeed, i could love to see a game like that. But you must remember that even though most civs started as city states, other evolved into real Empires, faster than others (notably Egypt). And the early Chinese (Xia and Shang dinasties), the Indus Valley and even early Korean civs must be included. If someone includes them i couldn't be happier.
Of course if there was to be an expansion it could include the Post Bronze age civilizations: Persians, Carthaginians, Macedonians, Romans, Seleucids, Palmyrans, Ptolemaics, Early Japanese, and last, but not least, India after the Vedic invasions.
On the other hand I think that the editor in AoE/aoK is better than that of Mythology.
[This message has been edited by Suppiluliuma (edited 02-27-2008 @ 03:37 PM).]