The likes of Boudjellal, Lonzeretti, Craig and the charm school that own Saracens do not believe that the International game compliments the club game. They are quite openly hostile to the international game.
Now, maybe you are right about the balance in Australia, but why should the NH compromise their season to sort out the SH's problem? And I say that as someone who thinks it is important that all the unions work together for the good of the game (and marginalize the scum bags who the Scots put in charge of the NH club game).
The problem is, whether we like it or not, and I don't particularly like it myself, the RFU are far and away the most powerful union and if they don't want something to happen it won't happen. The English establishment, who buffoon Twickers on match days with their pink trousers and car boot picnics, are still some of the RFU's biggest stakeholders, because of the debenture system, and if they don't want something the RFU won't do it.