I vote for option of voice-to-text. I also vote against voice chat. It would be great with a push to talk button so you're only entering text you want to say. Nuance has Dragon software for this, maybe VR can strike up a bulk deal with them and implement this software into the game. This software is surprisingly accurate, just a matter of cost and implementation that could be a major barrier.
I don't use voice chat. But even if I did, I would not want the Pantheon team to spend an ounce of resources on it when it's such a non-essential part of the game, as well as all the free options that are available out there. The voice-to text conversion sounds kind of cool, but again, I would not want any resources spent on such things as a functioning, bug-free game is my main concern.