I can't see Voice Technology ever being MUCH use, other than just commands/phrases to turn things on/off type of stuff. Till there is some reasonable Brain/AI behind it.
Until a machine can understand what the hell you are meaning as opposed to just recognising a waveform and running a command we're not going to get very far.
Getting to know they person, and how words are said, and in the context they are said, and the mood in the voice are all things it's going to have to deal with, also seeing you say the words, facial expressions, would help to.
We are years, probably decades away from this.