I don't think this is reasonable. The ACT has a population of under 500k people. Queensland has over 5.6m and NSW over 8.5m. For players prior to their professional careers I don't think it is overly realistic to argue that the Super Rugby teams have made much of a contribution in developing the players. They're far more a product of their genetics, parents facilitating their success and the schools/clubs they play for.
Even the kids who play Super Rugby 15s/16s/19s etc. aren't deriving the bulk of their development from those structures.
Throughout the history of Super Rugby, the Brumbies largely have had to recruit from the players deemed surplus to needs at the Reds and Waratahs and I think it is incredibly hard to argue that they haven't outproduced NSW and Qld in terms of turning those players into high level professionals and Wallabies.