Adding voice acting to established characters sounds like a bad idea. We all have our own ideas about what these characters should sound like, and no voice actor could meet everyone's expectations. If they were starting a new Zeldaesque IP, I'd say go with VA, but it just can't work in Zelda. Remember what happened to Sonic? That was partially due to terrible voice acting.
"Now, a fun game should always be easy to understand - you should be able to take one look at it and know what you have to do straight away. It should be so well constructed that you can tell at a glance what your goal is and, even if you don’t succeed, you’ll blame yourself rather than the game. Moreover, the people standing around watching the game have also got to be able to enjoy it." - Shiggy
