IMO, it has a lot to do with usage and the availability of alternatives. With ReiserFS, there were a lot of alternatives, both available at the time or announced shortly. While ReiserFS pioneered a lot of ideas, many of them showed up in alternatives fairly quickly. TempleOS is had a pretty limited user base.
I’ve seen many projects in the Clojure ecosystem get picked up and maintained by other folks. The key was always that the projects had an established user base of some notable size and something distinctive about them that made switching to other alternatives less desirable than continuing to push forward with a new and possibly more mundane maintainer and feature schedule. I’ve also seen a lot of “abandonware.”
I’ve seen many projects in the Clojure ecosystem get picked up and maintained by other folks. The key was always that the projects had an established user base of some notable size and something distinctive about them that made switching to other alternatives less desirable than continuing to push forward with a new and possibly more mundane maintainer and feature schedule. I’ve also seen a lot of “abandonware.”
So, it’s a bit of a mixed bag.