I used to use all sorts of small websites in 2005. But by 2015 I used only about 10 large ones.
Like many changes, I cannot pinpoint exactly when this happened. It just occurred to me someday that I do not run into many unusual websites any longer.
It's unfortunate that so much of our behavior is dictated by Google. I dint think it's malicious or even intentional--but at some point they stopped directing traffic to small websites.
And like a highway closeure ripples through small town economies, it was barely noticed by travellers but devestating to recipients. What were once quaint sites became abandoned.
The second force seems to be video. Because video is difficult and expensive to host, we moved away from websites. Travel blogs were replaced with travel vlogs. Tutorials became videos.