Forking is an approach to keep the project moving but the underlying problem is then notification & distribution. If I use one of the package managers - npm, composer, gems, etc - people only know of the original project and have its namespace somewhere in the project.
If I fork a project, resolve all the issues, and make it better, faster, etc, there's not a mechanism for those users to pick up my fork unless they actively go looking for it.
I think many of those package managers would be well-served to have a 301-like redirect saying "deprecated, but continued over in this new package"