I think a whole ton of full voice sets for every possible PC would be cool . . . but probably not practical. I think it would be best, for a game in which you are not playing a fairly specific character (Commander Shepard, Geralt of Rivia, Mike Thorton, Hawke, etc.), to keep the protagonist silent. There would have to be too many variations in a game like this, and trying to make them all fully voiced would ABSOLUTELY reduce the number of actual dialogue options we'd have in the game.
