Around 60% of packages on npm have not been updated in a year or more. Despite the lack of maintenance these packages are still downloaded billions of times.
This is a problem across many other languages/frameworks as well. Many popular packages have a single maintainer and the entry in the package manager index is accessible only by that maintainer. If that maintainer stops paying attention, the problems could be worse than the package just bitrotting, as we've seen from supply-chain attacks like event-stream[1].
There are volunteer orgs like Jazzband[2] which take group ownership of popular packages to ensure ongoing maintenance, but I've not seen many of those so far.
[1] https://www.hillelwayne.com/post/stamping-on-eventstream/ [2] https://jazzband.co/