Although the number of questions asked dropped noticeable with upcoming AI, I do not believe that to be SO's death. What answers would AI give if it could not lookup a good amount of knowledge that has been carefully cleaned disturbing or false information?
Yet I perceive that my last couple of questions on SO were not answered by anyone but me. Are there no more experts available?
To give an answer:
I noticed it is getting harder and harder to ask a good question without getting downvoted or deleted, just because someone else had asked the same. Did he? That other question is formulated with a lot different words - Google or the SO help would never pointed me there. Someone knowing the answer has - but that does not make the question a duplicate. It's more two question that relate to the same answer.
I noticed it is getting harder and harder to give a good answer without being downvoted or deleted. Not even a reason is given so you know what you could do better next time.
I have seen questions that from my POV were asked clearly enough to deserve an answer. But then someone decides otherwise and they get downvoted and closed. In such cases the downvoter (possibly the moderator) took action although he had no clue what the question related to.
In all these cases the communication and relationship between someone asking and someone responding is broken by the system itself. I strongly believe SO is overregulated. If this does not change, it will choke to death.