I like all the concepts being bandied about.
That said, there are limits. Form, price, etc. As an example, I did not purchase the original Echo. For that price and with that spatial occupation it made no sense in my environment. But the moment it became a thing that can easily be mounted out of the way for a small price and be incredibly useful, it became something I wanted to integrate into my environment.
And there are other considerations. I like the idea of just talking to my house, and having it respond to my commands, without me having to 'engage' it in a conversation. You can also easily (using tools other than Echo) devise mechanisms that will withhold notifications until you arrive in the room, and then speak them to you.
Echo fulfills the job of getting people acclimated to talking to their homes. The remainder will arrive in the not-distant future.