I'm open to new ideas but I can't imagine this being a very efficient way to input words and characters into a computer. I have worked with older game consoles and remote controls that tried to do this stuff and I'm not sure anyone likes it.
Why not simply speech to text? I don't think a lot of people are doing VR in a room with other people.
The article states the firefox reality actually supports tts.
Just because people don't like it initially, doesn't mean it can't become a fairly fast input method given enough practice. Here is another example of a keyboard in much the same vein as using a controller, for people with carpal tunnel syndrome: https://orbitouch.com
Why not simply speech to text? I don't think a lot of people are doing VR in a room with other people.