I realize that I have no real idea the amount of work this would require, but I cannot help but smile at the thought of being able to listen to every character talk to me. Having a fully voiced script would add a lot of charm to the game, I feel. While the text-only option is certainly the safest and easiest, there's something to be said about how the character comes alive when there's actual pacing and inflection in their words that aren't your own. In addition, I think that the various 'cues' that characters give might become more apparent to the player, giving them the ability to better 'read between the lines' and judge the character's disposition before selecting a reply or action. Unrealistic? Perhaps. Doesn't mean I can't wish for it.