Thinking about my own team (NQ) and a draft.
Currently we have 2 footy schools in Tvl, Kirwan High and Ignatius Park that the Cowboys utilise to place their kids for not only schooling but the football programs they can provide.
The kids from roughly around age 15 that come from outside of Tvl (think Brandon Smith, Kikau, Taumalolo, even Nanai from Cairns) come over and finish their schooling off, play and train with their school side as well as train with the Cowboys systems.
Without the Cowboys signing these kids and placing them into their own and the systems of renowned RL high schools, I'm not sure the kids will get the development and preparation needed from either of the high schools or clubs from their home areas.
In the US, colleges make huge money from football crowds, merch and TV rights from whatever conference they can get themselves into (think big 10, SEC , Pac 12) it's in their interest to get the best kids into their system as well as invest in their system (CoE, facilities) so they can maximise their profits as well as have what's considered a "Prestigious Football Program" which means you are more attractive to good kids which in turn means you make more money......
High schools in Oz don't have this abundance of money and elaborate facilties to throw at kids, if NRL clubs don't get something out of it, they're not going to develop anyone because what's the point if the kid can be picked up by a rival NRL club in the draft........so who is going to develop these kids?
Unless the NRL throws a bucket of money at specific high schools where they then become collegesque then I just don't think it will work.