If I was a betting man, I would put money on in the next few months seeing a whole lot of layoffs and / or "spending more time with the family" at the higher end of town. Some of those call centre contracts are probably also in serious jeopardy. This level of bad press which is not going away is the sort of thing that kills companies, so I would guess no idea is too crazy to get customers back on side.
They are likely going to bring back onsite staff at airports. They are also likely going to bring in some really great sales to convince people to give them another go. As someone else mentioned, QF being terrible is now water cooler talk, so they need to win people back as customers and nothing does that better than rock bottom prices.
Back when it was simply the FF crowd who have complained, QF didn't care. QF know that the media would never publish a sob-story from someone who routinely gets F-Lounge, and assuming the media did publish such a story, very few of the general public would care. However it's now "battlers" who are getting the raw end of the stick, in quantities enough that the media takes notice. That's going to ensure at least someone in QF gets walked.