I don't believe that it's a requirement to appoint a coach to manage the S&C of all the players in Australia..
We can see that the Reds in 2011 and Brumbies in 2012 were two of the fittest teams in the comp.. The knowledge and will to achieve the required conditioning levels is present within Australian Rugby, it's just not known/understood by all.
If anything, it might be wise to pool resources and share some of the information to other provinces in addition to a means of implementing it.
As Laurie Fisher said in the last podslam, different team game plans will demand different S&C - rightly or wrongly (looking at you Tahs)
So it's not one size will fit all. If those discrepancies exist and it doesn't suit the way the National team will want to play, then something needs to be able to happen.