I do use Qantas where it makes sense to - e.g. last week for SYD-WLG - cheaper than Air New Zealand
I have also been managing some ATW bookings for a friend and have had to make calls
For wait times of 6 minutes I havent been offered callbacks but a 9 minutes I have
If callback becomes generally offered at that time level, I don't see it as a big issue if there is a wait time
It may be 2 international configured aeroplanes, but I would much rather a shorter joruney and I would settle for Qantas over Cathay to save 2700 miles of travelling.