well its definitely not all voiced. the old man character doesn't seem to have a voice (clips of gameplay have shown him having a box of text). I think its very unlikely that Link will have a voice.
I honestly don't mind voices as long as Link remains silent. IMO the biggest thing is being able to be immersed in being Link, whether you're a chick or dude, or have a low or high voice, as soon as Link has a forced voice it may alienate some of us by breaking immersion
same sort of thing applies to Fallout, the new voiced protagonist turned off a lot of people.
But I'm cool with voices as long as Link is the one exception.
However I 100% agree with the OP that the best absolute option would be to give an on/off feature for voice. Doesn't seem like it'd be that hard to implement that
