I’m not sure they would implement this anytime soon.
But this reminds me, I do have a project in the pipeline to hook a speaker up to the API and have the API triggered at random intervals and the speaker emitting random things throughout the day that the AI is producing in the background 
You could just put such a speaker in a public place and have AI PSA’s. No other devices required from the perspective of the user 
But it’s more of a side/learning project for various standalone dev boards, more than anything.
I do think a virtual phone call with AI is cool, even better a virtual video conference. Someday … someday.