As far as I am aware, no one has been able to make a successful Voice First product. Some products, like Spotify or Audible, are greatly enchanted with Voice, but voice is just another access point.
There's a successful Windows app called VoiceAttack that will let you use voice instead of controls ingames.
They also offer voice packs spoken by famous actors that are popular. Having Kirk's voice update you on the status of your space ship is enticing.
