I have never, ever bought into the narrative that voice acting (or imitation of cinema generally) is some kind of natural forward progression in game design, but I'm someone who watches no end of silent and black-and-white film, so what do I know.
The precedent set by Fire Emblem should be an absolute cap. Limit it to characters saying one-word hellos (or splooshes and kabooms, if you prefer). Otherwise, in practice I foresee cutting off a lot of dialogue mid-sentence just to scroll through text.
Zelda, like Metroid, draws much of its power from the serenity of silence and by implicitly communicating the world through environments and interactions. Metroid already compromised this to its own detriment in Prime 3 even before what happened with Other M. Zelda could do with one serious improvement in the delivery of dialogue, and that would be clearer textual marking of who is actually speaking, as that doesn't tend to line up with the images in reaction shots and exchanges can be a little disorienting.