Yeah, I used to work at a university, so I've been around since the earliest days of the web. It's kind of ironic that from the very start one of the big misgivings from academics about the web as a research tool was the ephemeral nature of its content. One of the examples given back in the 1990s was that a lot of websites that people had begun to rely on were really just some grad student's pet project, and when they moved on someone else might or might not pick up where they left off.
The scale of things has certainly changed since then, but nothing seems to have become more permanent. Just the other day I went through my list of bookmarks on a topic, and easily half of them now lead nowhere, even URLs for major news outlets and blogging platforms that are still extant.