Don't be under any illusions, this isn't the beginning of the reduction in Qantas staff numbers, this graph is compiled with data from their annual reports.
Just need to project it further forward as the trend is well and truly set in motion. Basically, every Qantas member that leaves is being replaced by a Jetstar member on lesser conditions. Every airframe that isn't bought for Qantas is bought for a subsidiary.
It's been on average 1000 per year since 2005 leaving the Qantas mainline ranks, plus another 1000 in a few months, projected forward with the impeding retirement of the 767s and 734s and 744s with the addition on 12 738 and a handful of a380s, the future can easily be predicted.