That is quite the wish list

! A more logical (Seeing the map is expanding east and north), concept would be (For Greek wars anyways

)
Kingdom of Macedon,
Achaean Leauge,
City-State of Sparta (Just a logical solution, seeing it was a very hostile and independant State at this time)
Then making some of the regions that are occupied by the current "Mini-Factions" into real factions. Only a few new units will need to be made for these, because they are already ingame as AOR units

.
Averni Gauls
Aedui Gauls
Kingdom of Illryia
Kingom of Lusitania
City-State of Massallia (Or Phocean Greeks)
City-State of Syracusa (Wishfull Thinking

)
As you can see, for most of the lesser factions I mentioned are already ingame. And this would still only fill up 19 out of 21 faction slots (Rebels included). And if 2.0 is going to be the final MAJOR release of FOE, then it is only logical that the developers will try to fit as many factions as possible

....