I don't see why they'd offer that option - the leaders represent specific historical figures and many of them have dialogue that refers to them by name. Nor do I see any point to it.
As soon as you take them as your "player", you are modyfing their agenda, etc... therefore they don't represent that much the historical figures. I use to make anagrams of their name and mine... so i.e. If I play egypt, I'll be playing Cleosephias, or if I am playing Aztec it would be Mosephzuma.
There is also a very, very practical reason to do so: default save game uses civ. leader name and year, therefore, if I want to keep my first game as Cleo, and then do a second game, I do not need to specifically save first Cleo's game files apart, but trigger the second game as "Joclepatra" or "Closephias II".
And, of course, there is the need to differentiate your games in the Hall of Fame --
Errm... just forget about that...
Yeah, I think fond memories oft repeated here of the advisers in Civ II is part of what lead them to go with one look for all the governors. The OTT military advisor is def the inspiration for the Castellan! The difference to me is that the advisers were a humorous/sometimes helpful take on what was happening in game...they weren't actually part of the game themselves.
I'd also say named-fixed appearance caracters are also more bearable if you interact with them, instead of a bunch of stats. You might like or hate Elvis the happiness advisor, but he was there, talking to you - it felt like you cannot always select your advisors and ended up with some people and their personalities (that, btw, acted nice and less irritating if you meet their specific area). "interaction" made it easier for you to bond with these characters, whether you liked them at first or not.
Therefore, I'd strongly suggest firaxis, if there's still time (or if not, if it can be patched), that have a look at governors screen and see if it can be used also to throw-in some advisor quotes. I may get closer to Pingala if I imagine him recommending which tech to research next, or warning we are behind in civics. Victor for Military and Amani for Foreighn relatios are clear matches. Most difficult think is to split the Domestic advisor in four, but indeed their area of responsibility is clear: Markus (production and strategic resources - take them away from military), Liang (number of cities, luxuries, amenities, appeal), Moshka (religion-related topics) and Reyna (finance). I would not develop anything fancy - just entering text quotes as the advisor panel for Civ V. But having these named characters "talk" to you might be beneficial.
In my opinion, the governors should've taken names from the same pool as the delegates and spies already do to begin with. While "Brynjar" and "Akira" probably wouldn't fit Pingala and Magnus, respectively, it'd at least help in localising the civs further.
Of course, best case scenario would be that they had civ-specific portraits and names, but I don't know if it's too late in development to change that. In any case, there'll probably be a mod that changes it eventually.
On civ-customization topics, specific portraits might bee to harsh on resource dedications, but some colors adjustment, mainly in clothes could work to make them more associate to each city. As the names seem to be representative of their area (as some pointed out "Amani" means peace in swahili, "Moksha" refers to sould trascendence, and "Victor" is probably given because of victory), it will be interesting (if perhaps a bit heavy on research), to have names with this similar meaning in the Civ's cultures.
Therefore Amani will keep Amani for congo, but will be named Irene for Greece, or Paz for spain. Victor may keep as is for europeans, but be Huosheng for china, or
Chyochomneah for khmer, Moksha might be Ascensio for Rome, and Mitlan or Tlaocan for Aztecs.
A thought just occurred to me. If Bread and Circuses is the new project for the Entertainment Complex, what becomes of Brazil's unique Carnival project that makes Great People points? Is it combined with Bread and Circuses or will they get some kind of redesign?
It may just give you both options.
Yes, as I heard it, it seemed to be an additional project, but who knows?