I decided to see how many of the links on this blog that still worked after all these years. It wasn't encouraging.
Wikipedia was rock solid. I had to switch from http:// to https://, but that was it. Doing that simple search-and-replace got me 889 working links out of 2259, or 39% working links. After some more http:// to https:// I'm now at 44%. Less than half isn't what I'd expected, but then again, this is the first link maintenance in 20 years.
Sadly, there doesn't seem to be a good solution to the problem - IndieWeb had a panel discussion about link rot[a], other bloggers run into it[b], and The Verge noted that 38% of webpages from 2013 are now inaccessible[c].
Maybe all links on all sites will, given enough time, end up leading to the Wayback Machine[d].