I think Australia are facing far bigger problems than England.
Harris and Haddin are finished.
Rogers and Clarke are on their way with Shane Watson following close behind.
Voges is too old, and Johnson isn't getting any younger. Both the Marshes look a bit suspect at the highest level, so that doesn't leave a lot (of this current squad) to get excited about.
Only Smith, Warner, Hazlewood, Starc and Lyon are likely to be playing Test cricket in 2-3 years.
But back to this Test: a healthy 1st innings lead is essential and Cook to captain with cunning and nous and to use his bowlers well.