From a professional point of view, not saying its right, its my opinion:
I think it should. I mean there are times when I just want something said. It doesn't ruin Zelda's feel. They are so close to full voice acting with all the grunts. It would've intensified the last scene had there been a booming voice coming forth. And as for Link not talking. I draw the line. I know Miyamoto wants US to make Link who we want him to be. But this game felt forced. He has so many facial expressions that he is his own character, there were times when he just needed to say a line.