DJ dropping YSSY-YSCB is SENSIBLE.
YBBN-YSCB seems a POPULAR route though - I recently flew YBBN - YSCB and return for a vacation (a couple days research at the Australian War Memorial). BOTH sectors had a full aircraft, with nary a seat spare.
Let's face it - Canberra is a HOLE tourist wise. I would estimate that the traffic YSSY - YSCB would be predominately bussinessmen / government, and undoubtedly a vast number would prefer a business class seat. Whilst many businesses and government agencies are bcoming MUCH more economy oriented, I am positive QF is kicking DJ in the bums on seats for that sector.