Well, personally I preferred the 'envoys' you spoke to in civ2-though it would be good if they were more realistic. This would allow you to still have a 'fixed' person whom you can love or hate, whilst still allowing for easy modding and addition of new civs (after all, there is nothing to stop you from using a mid-east style envoy for middle-eastern civs, a Western European for Western European civs etc etc)
Also, though I would LOVE to see more civs in the game, I would prefer them to be as 'minor nations'. Nations which grow at a much slower pace than major civs, but which help to fill out the space a lot better than goody huts and barbarians.
Yours,
Aussie_Lurker.