I think too often people think too big and not small.
I agree in that a major stepping stone is get the technology in front of the public, so they take more of a commercial interest in it... which causes the industry to take notice.
Just as with their touch based UI, Apple helps greatly with that all important publicization step by including Siri with their phone.
It's only a matter of time until cars and homes have an AI installed to do tasks by voice.
We all said that thirty years ago. Sometimes I can't believe how little it has advanced since then. Except in the movies, of course
There's the right time for every product, though. Today, many young people are more comfortable talking via objects than directly to other people.