It still seems early times with voice assistants. Working with one seems transactional as opposed to conversational, to me anyway. I think that once this is overcome and we can converse with a voice assistant they will be more widely adopted.
It will never happen, for a very simple reason: the first moment Alexa becomes non-transactional, I (and everyone else who owns one) will tell her to stop trying to upsell me on additional features. Boom, that's it for Amazon, game over.
But there's no reason a conversational language model needs to know how to stop doing anything.