I would like this as well, but I also don't share the same enthusiasm that some have for the Warden. It wouldn't bother me if they gave him/her a voice. I see my time with them as over. I would like to see them again, but I don't care if I don't ever see them in another game. I want the DA story to keep branching and moving forward. One of my favorite things about DA is that the protagonist is different in each game. Just my thoughts on it, such as they are.
The world of Thedas is alive and feels like progressing due to the fact that characters we know and systems actually live, evolve. Lelianna, Morrigan, Alistair, Zevran - they all have their own lives, they don't stop existing once they finish being our companions
Same should be said about our Wardens and Hawkes - we might never play as them again, that's fine. But they still continue existing hence they should get at least mentioned