In what sense will it be killed? I don't plan to stop writing my own messages or notes, just because AI can write, and I seriously doubt many other people who prefer their own voices will change either.
Well, imagine that 90% of the comments on HN are generated and it's very hard to spot it. Would you read them?
I stopped using reddit entirely because it's bots talking to other bots on threads posted by bots, I stopped making posts at the start of this year because I no longer know if a human being is ever reading them. I then deleted the account.
I am increasingly feeling that way about HN, too. If this is all the equivalent of a videogame conversation with an AI, why am I bothering to put the effort in?