I have recently split the huge repos for rqt common and robot plugins [1]. The separate repos will make it easier to split the work and allow each maintainer to decide on the release schedule independently instead of having to sync between all and having to balance update frequency with unnecessary releases for other plugins.
In this process a few rqt plugins are still looking for a new maintainer. If you are using any of them and if you like to help out please consider speaking up on these tickets. Otherwise the plugin might not be maintained in the future and become unavailable in future ROS distros:
If the plugins you are relying on is not on the list but you would still like to help I am sure the current maintainers appreciate any support. If you would like to help them in the maintenance work you can always triage tickets, test pull requests, improve docs, etc and become a co-maintainer.