AI, and specifically conversational interfaces, don’t and won’t “kill UX”.
Because the user experience (UX), what the user experiences, always happens. And UX is not UI.
Technology doesn’t happen on its own.
Technology has no purpose without users.
The only way for user experience to not exist is if there are no users.
And without users, without value, without purpose, there will be no technology — only technical curiosities.
So, for the actual AI technology — the one that involves users — who do you think is and will be in charge of modeling the AI personality and manners?
Regardless of the title they come up with for that… it will still be UX.