There is an adoption process for truly inactive maintainers: http://neilb.org/2013/07/24/adopt-a-module.html - you can also often get somewhere by just asking the current maintainer nicely by email. The timeliness of the process in the event of a non-repsonsive maintainer depends on luck and how much depends on the module. In the end it doesn't matter if a group or a person adopts it - someone still has to decide to do the work.