So really, what does the FDS concept gain them at this point? Why not just do away with it?
Really? And kill the goose that laid the golden egg?
I suppose they could've claim authority to serve as mediators, based on OT thinking pertaining to the Levite tribes (the ones who ran the temple).
However, why do THAT, when they could simply appeal to Jesus? Remember, he was a veritable fountain head of half-formed nebulous concepts (AKA parables), and he mistakenly left one lying around that was PERFECT (well, not really, but it'll do), just begging to be twisted into a prophecy that has proven very lucrative indeed to those who co-opted it for their own purposes.
The GB has squeezed out the authority of the anointed ones, just so they can't have some cranky ol' 90 yr old fools try to pull rank on them, telling them what they should do (I'm sure they had enough of those interlopers in the last century). What self-installed authoritarian body ASKS for oversight? Now they just have to wait for the anointed class to die off, and then everyone will forget about the 1914 "last generation" thing, and they're the last man standing.
Interestingly, the NWT is the ONLY translation that translates the phrase as, "faithful and DISCREET servant"; ALL the others translate it as "faithful and WISE servant". I still haven't gotten any explanation of why they chose the word, "discreet", unless they were trying to discourage the kind of thing Ray Franz ended up doing: indiscreetly sharing insider dirty-laundry....