Ok from you comments i can see you have NOT played a game with PC voice acting or you have forgotten just how open your responces are.
First you can in ME1, Me2 and DA2 the only three games I know of that have PC voice acting, be polite, rude, aggresive or snarky. There are multiple responses you could give. So while you had the same voice how and what you said was the choice of the player. So you are not in point of fact stuck in a pre-determined role in terms of how you play your character, the character does not become their character at all because you are in complete control of the actions of the character and what you say, at least what you say within the same limitations of any RPG that just used text responses for the PC.
Are you deliberatly trying to slant your responses to make it appear like there are no options in how you can play your character in ME1/2 and DA2? You have only ONE pre-determined aspect in each of those games your race. Your role isn't predetermined anymore than oblivion. In oblivion you are the person the Emperor fore saw that would save the world and help martin light the fires. And in the other games you have the same large arcing role but who you are within that context is up to you. Your gender is just as open as TES. unless you are telling me my copy of oblivion is missing a thrid gender. Your class and how you structure the skills within the class as very much up to teh player. it is not like BW is known for making games that don't encourage creativity. Why do you imply that voice acting equals the end of creativity?
i do not think you need to voice each race differently to be honest there is very little difference in how the races speak with some exceptions. As I recall the khajiit and Argonians were done by teh same person. There was very little difference between one race to the next for the non beast races. Yes they were done by different actors but its not like there was huge differences. All in all the races in Oblivion sound much the same expt for the orcs sounded differnt in that they very harsher and then beast races. I am not convinced that you would need a different voice for every race to have significant advantages. i will however conceed that with the TES series having the orcs and the beast races sound like the more humaniod race would be too much of a leap. So they may need 4 actors instead of two.
You quote my post where I speak of Dragon Age 2, then claim that I've never played a game with PC voice acting, yeah that makes sense... <_<
In mass effect you are the first human spectre, you run around shooting people, saving people, saving the galaxy from the reapers etc. etc. same goes for mass effect 2, with the exception that in addition to being a spectre, you also find yourself working for cerberus. The voice options in Mass effect are a result of 3 options (we could call them good, bad, and neutral), so in essence you have 6 possible options, male good, female good, etc. etc. In addition, there are some unique dialogue lines and quests based upon which backstory you selected (there are 3 options if I recall correctly, war hero, spacer, and colonist). But despite all of this, you are still Commander Shepard, you still have to save the galaxy, you can't change your name, you can't change your actions. In dragon age 2 it's quite similar, your character is named Hawke, or sometimes 'the champion of kirkwall'. You can choose from the same 3 options again (personally the funny/neutral one is my favourite), but the same events are going to happen, and when the game is over, it's over.
In TES your character can have any backstory that you can imagine, you can be any of 10 different races, 2 different genders. Without a voice you are free to roleplay your character as far more than polite, sarcastic, or direct, you can be anything. Not only that, but you can also do anything, you don't need to save the world from the dragons, you can live as a blacksmith if you really want to, and never even see a dragon, and when all is said and done, you can keep on playing for as long as you want. Now how can you possibly say that having a voice does not limit the experience?
They also mentioned in one of the articles or podcasts releases thus far that they are working to make each race more unique than they were in Oblivion (perhaps making them more like they were in Morrowind), whether or not this extends to voices remains to be confirmed, however it would make sense. therefore it would be silly to give multiple races the same PC voice.
By adding a voice, you restrict the choices that you can make, you restrict the number of side quests which you can complete, all in all, you are left with far fewer options, and an experience which is no longer unique. I can see no reason why the TES series should wind up like so many others, and become a linear experience.