Our relationships with brands are formed via an connection, and voice interfaces are by far will have the deepest emotional impact on users. It's just something as immediate and direct as voice. Voice creates connection and spontaneity like nothing else, probably only behind touch.
The contextual 'connection' in psychologically 'intimate' or 'vulnerable' moments is huge! Be sure of voice interfaces becoming a therapist, a friend, a storyteller, a philosopher, a mother, a priest, an icon .... the possibilities are endless. Finding moments to connect with voice AI - play a song tell me a joke.. these will be moments which forge an emotional connection with users and transform the vitamin-like features into painkillers.