Feed readers are also simple, and in fact they were even easy to self host, even on the desktop! But Google Reader came in and was such a good design that everyone used it.
When it went away, blogs were still *there*. But blogging as a *syndication medium* died. One big player left, and it's gone.
This was sad for me especially; my favorite medium on the internet ever was webcomics. Webcomics still exist, sort of, but the loss of independent publishing and aggregation meant that they had to change to survive.
The shape of webcomics started to get shaped to the shape of Twitter's image box.