"Two things: I had some bright young people research this issue almost 20 years ago. The conclusion they came to was that the adoption rate would be very slow (that proved to be correct.) Why? It's uncomfortable at first, and it is uncomfortable for a long time.
Next, it changes the relationship with your device. If you press the wrong key, you think "Expletive, I made a mistake." If you say a word, and the device misinterprets it, you think "You dumb expletive, YOU made a mistake."
They also concluded that the improvement in efficiency was minimal at best, sometimes non-existent, and often was the opposite. Typing, proofreading and correcting is faster than speaking, proofreading and editing. Note the difference: "correcting" vs "editing." Our speech "voice" is very different from our writing "voice."
The second thing? You missed quite a few typo corrections. You would have picked them up if you were typing the article."
My pred-ICT-ion for keyboards is in line with Piet's comment: for the next 10 years keyboards will be the number one choice for text input.