Chances are you could already get a sentiment vector with every sound-bite with respect to tone. Body language will clearly need more than a microphone as sens

Chances are you could already get a sentiment vector with every sound-bite with respect to tone. Body language will clearly need more than a microphone as sensor to do it well, but as RyanMcGreal's comment hints at, the fact that a system like this isn't particularly good is no guarantee that it won't be used.