> Everyone should be using the command line if that argument were true.

Well, yes — they should. Would you rather communicate with speech or by pointing and grunting?

We do need better languages for conversing with our computers, but we can't get rid of the need for language.

They should... and they do, in the form of Siri! I hope someday it outgrows its current limitation to relatively simple tasks.

Is Siri big in the US? Here in Europe I see a lot of people with iPhones but I have never seen anyone use Siri. I have seen my friend attempt whatsapp messages via the vice recognition thing while he is driving, but it looks way more hassle than what it is worth.

Using that argument, having a keyboard is too advanced as well. A microphone and a pointing device should be enough. And it is, but we all know not having one kills productivity.