Interestingly, stackoverflow's data loses value fairly quickly with time, since new langs and dad's come so quickly. So while they dominate today, they could be replaced.
Amusingly most of my recent posts are not exactly desired, but the old goodies "copy folder structure without files in bash" and "How to handle exceptions on [6 year old] JS grid" keep getting upvotes because they're interesting to folks who are new to the area.
They were questions I had at the time, and tech I worked with that I don't any longer but still in wide use.