I've cited a very convincing example just two posts above yours.
You misunderstand - I wanted to postulate a hypothetical situation where voice recognition (or, say, telepathic recognition) works with absolute perfection, come hell or high water or the noises of a newsroom. It now perfectly takes your dictation. What then
The OP seems to want an input device that does away with the inputting of text by typing. Well, now he has got it. What possible use could he now have for a keyboard, be it a dull QWERTY one or a flashy LCARS one? Everything he could ever want input can now be input the same way his keyboard-sidestepping dictation can.