If an LLM-based voice assistant/hardware combination works as well as ChatGPT-for-voice works today, I don't think it's a stretch to say that nearly everyone in the coming years will use/have one (the software of course will be portable to whatever device you're using--house, phone, car, etc. But the hardware portion I do believe will be critical because most of the time using it will be at home in a room and in that scenario sound quality will actually be key).
That said, if nearly everyone will find utility in an assistant, obviously the biggest issue with using one of these, as this Amazon announcement illustrates, is whether you really can trust the company with such a thing when you would be having entire conversations about everything from your interests to something as sensitive as your emotional state (anyone simulated a therapy session with ChatGPT? It arguably is already a decent therapist!).
One of two things will happen, though. People will be dumb enough to "upload" their deepest darkest secrets to megacorp x (thousands of HN users cackle in the distance as if that's not happening today) or a completely privacy-safe option will be available and will win because they're able to effectively communicate that they are in fact private. It's one thing for Google or FB to build a picture of who you are, what you think, etc. through browsing activity/purchases/etc. It's entirely something else for you to literally tell them every last thing about you so that they can hear, in your own words, how you think about "everything."