What if... Link doesn't speak the language of the area the game takes place? It would be like Link ending up in Termina after OoT, but he wouldn't be a Deku, he would just be unable to speak to people, because they speak a different language.
The first thing you'd have to do is learn a bit of the native language(which would be completely constructed for the game: writing, speach, etc.). This knowledge you can later use to understand vocal soundtracks in dungeons and during bossfights telling you what to do. The solutions would still have to be logical, as Nintendo wouldn't want to alienate fans who don't bother learning a few words of the in-game language.

This is probably WAY too ambitious, and if it would happen, maybe only Japanese gamers could enjoy the feature(like with the tWW-Hylian in the game manual).


Anyway, even if it would be only like Super Mario Galaxy's vocals, I would love it.