The tricky thing is that Link doesn't talk in the games. To do a film with him as the lead character and have it be an Illumination film aimed at kids... they're gonna have to have him talk and it'd probably be pretty controversial among the fanbase, but really, if you're making a movie where he's the leading protagonist, he sort of has to talk. Not all the time. They can portray him as a wondrous person who doesn't like to talk much and takes in the beauty of the world around him, etc ,etc.