Although it will never happen in a million years, I quite honestly would prefer Beth to go back to text-based dialogue, with snippets of speech for important bits, overheard conversations and so on. The amount of space that is taken up by the audio just seems a waste, considering the massive amount of text that could replace it, giving us more topics and so on.
Anyway, back on topic. Yes, I would prefer a little more variety in the voices we hear.
Couldn't agree more.
If we must have fully voice-acted dialogue (and it seems we must), at least don't confound the content, time, money, and resource cost by limiting the voice acting's quantity or quality. I would expect Bethesda to deliver in this regard, though, as it's an area of improvement that they've mentioned specifically.