In an alternate universe, where LLMs didn't exist, I bet you SO would be equally dead by this decade. Someone better, with healthier values and a more welcoming community, would come up and steal their lunch.
People here seem to be so emotionally invested in hating stack overflow that they seem to think AI was like ~10% of the reason it died, when it was 95%.
And yes, it's possible AI would have killed it anyway, despite its best efforts. But in this version of parallel universes, AI was only a catalyst. Its fate was sealed well before 2020.