How often do we see it though?
Australia win the series (Test or ODI) and lose the next dead-rubber match/es.
While this trend will never bite you on the backside (because you've already won), it doesn't help your confidence going into the next series.
The Test matches will be a tighter affair - Murali on 3rd, 4th and 5th day wickets will be dynamite. I think we may find a few spinners rushed into the side - Warne and MacGill, but also Symonds perhaps if they see the need for mediums early and spin later.
Lehmann and Katich can both bowl a bit too, so perhaps they will use these two as the extra spinners.