Hindsight is a wonderful thing. Personally I would prefer to take stock of the present situation (pretty dire at the senior level, but some good young talent coming through - as usual) and plan for the future.
I do not believe it would be a good idea to chase one of the top ranked international coaches. That's a waste of time, and smacks of desperation. I would prefer us to appoint an Australian coach. We should employ a specialist head hunter who specialises in sport, preferably rugby, fo find the best available Aussie. We should pick him and stick with him, through thick and thin, until after the next RWC.
Yes, the grass roots are vital (although I do not see any coherent explanation of exactly what the grass roots are, and how they can be nourished) but the health of the Wallabies is crucial.