Voice to text is handy in a bunch of situations now. Mostly when I want to send someone a message when I'm walking or typing. It's sort of neat for appointments, and I use it all the time for setting a timer.
Screens and keyboards, or touch devices, are remarkably effective at conveying large amounts of information almost instantly. Voice is not an efficient medium. Do you know why people hate voicemail? Because it's slow and ineffective.
Voice apps will be the next 3DTV, which should have been clear to everyone wasn't going anywhere. If you have to put on goggles, it might as well be a VR headset..
In the meantime, I can order from Amazon from my tablet in a few seconds, deal with issues and confirmations, while I'm watching Netflix on my 65" regular 2D TV.