If no one else is doing the job, get yourself elected chair and/or secretary (a simple vote at your next committee meeting) then the dog can start wagging the tail, rather than the other way round.
Even if powers have been delegated, they can be resumed by an elected office-bearer whenever they want.
But talk to your fellow committee members first about the money being wasted on this do-nothing SM to make sure they are onside before you put it on the agenda.