I think those who think that we will not need keyboards are missing a few important points. Here's the issue - I can type faster than I can talk. Also, in the classroom - 20 kids talking to their computers it would be chaos and a mess. Typing, however, has a speed benefit and doesn't require a "cone of silence" as a everyone talking to their glasses would. I think keyboarding will remain part of the productive equipment of most of us - until our devices can read our brain waves. For those who type less than 30 words a minute and work in a quiet office, this is likely to be true.
Meanwhile, this is a great read about what will happen in our homes, at least.