I'm probably too late to respond to this as I've only read the story now but if we have to remember that era the structures were different back then where every team had academies, state programs in every state as well as the AIS which meant plenty of pathways for young talent to be identified and developed.
Thrown in the year round calendar where kids would play state league in the winter and the national youth league in the summer and players would get 40 plus games a year which helped them prepare for the NSL at a younger age so they would go into it as more battle harden players.
Thrown the timing of success at youth World Cup level and doing well at the olympics and this formed the environment of the GG era to happen.
In a way i'm not surprised the FA want to bring the FA Academies in as this similar structure worked back then, would they bring back the AIS I guess we will find out if the govt. is willing to fund it in some capacity.
Right now where we only have the a-league academies and not every team has one as well, also even if the players play against men in the senior NPL there is merit to bring back a proper home and away NYL as well so players can play year round if they can't play a-league football, basically the players here don't play enough in this country and this has been a problem since the a-league era started and hasn't been addressed well.
I also have concerns some teams are playing young players for the sake of it which is why they going into the development route as the clubs are trying to run a tight ship especially now, the thing is young players need good mentors and good players around them to develop playing them for the sake of it wont develop properly for challenges of overseas football.
Thrown in our inability to qualify via the tricky route of the AFC which has meant less youth World Cup appearances and olympics which have dried up and overall less international exposure and larger eyes of scouts which the GG had to get overseas moves.
Get back to similar structures this time around with the emerging NSD and it would help also if every a-league had academy teams as well I don't know why some have removed their youth teams in favour of letting the NPL teams develop the talent only to take them when they are ready I feel the NPL clubs should be financially rewarded for it if this structure is in place, thrown in the FA Academies and maybe the AIS and then maybe we can get another GG in the future?
Who knows but the powers at be need to try and not cut corners when it comes to developing talent.
Sorry for the long answer