The more likely scenario is that they will be allowed to stay in LH if they wish and SH is slowly being phased out and replaced by Jetstar.
The full service model domestically has a limited life in the current market and SH will slowly disappear. The model will be A380 /787/ jetstar Domestically and internationally and perhaps trunk route limited premium offering at peak times domestically
The world is changing rapidly and Qantas is evolving