While not specifically related to today's big announcement, the continuing rise in 'community transmission' coronavirus cases today in Victoria - 33 new total cases, but not well broken down yet - is according to Geoffrey Thomas of that aviation site and others likely to cause further problems for airlines.
The Queensland Premier has an election at the end of October, and has previously said that her state's borders would reopen on 10 July 2020. It's not yet clear if she will defer that date, or merely announce a ban on Victorians visiting, or Queenslanders going down to Melbourne/Victoria.
However today the NSW Health Minister said that rugby tickets wouldn't be sold to Victorians. They're a small group compared to Victorian AFL supporters but it still means less interstate travel.
WA Premier has doubled down on no border reopening yet.
No airline or medium sized or larger tourism enterprise can reopen instantly, so some will have been already planning (for instance) to increase staff given that Victorians are either the #1 or #2 source of interstate visitors and spending in the other states.
Fewer tourists means fewer posteriors on airline seats, and fewer pilots/cabin crew/ground staff (and head office staff!) required.
So QF plans to increase flights may turn out to be ahead of demand due to factors it cannot control, such as the incompetence of some State Premiers.
Certainty is what we all like if planning holidays. We lack that.
Business travellers may be more used to short notice trips, but these cannot occur if travel bans remain between states.