- The reduction of questions over time is asymptomatic of SO. When you have a library of every question asked, at some point, you asked most of the easy questions. Have a novel question becomes hard. - This graph is using the Posts table, not PostsWithDeleted. So, it only tells you of the questions that survived at this point in time, this [0] is the actual graph which while describes a curve that shows the same behavior, it's more "accurate" of the actual post creation. - This is actually a Good Thing™. For years most of the questions went unanswered, non-voted, non-commented, just because there was too many questions happening all the time. So the general trend is not something that the SO community needs to do anything about. Almost 20% of every question asked is marked as duplicate. If people searched... better™ they wouldn't ask as many questions, and so everyone else had more bandwidth to deal with the rest. - There has been a shift in help desk style of request, where people starting to prefer discord and such to get answers. This is actually a bad thing because that means that the knowledge isn't public nor indexed by the world. So, information becomes harder to find, and you need to break it free from silos. - The site, or more accurately, the library will never die. All the information is published in complete archives that anyone can replicate and restart if the company goes under or goes evil. So, yeah, such concerns, while appreciated, are easily addressed. At worst, you would be losing a month or two of data.
[0]: https://data.stackexchange.com/stackoverflow/query/edit/1926...