To the Op, who's contributions and view I always enjoy, if not always completely in line with my own
You want a crystal ball? Well I will give you my view, my "two cents": (and from me it will become apparent that two cents buys a lot of ideas
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First up, I have absolutely no doubt that this Corona virus will be officially declared as a global pandemic within the next two to four weeks. I think this will be sooner rather than later - so my best guestimate is within about ten days - the delay or difficulty being due to the recalcitrant countries where it is breaking through from (Italy and Iran specifically - but there are no doubt others that we do not even know about yet) I have some "insider" info on this, but you do not need this if you just understand what is openly in the media - basket-case countries like Iran already have it, and they are sending it on to countries with even far less chance of control than themselves, where it will go ballistic and remain. So trust me, this thing will go completely global.
How will airlines react? Yes, some airlines are withdrawing fleet and routes, to compensate for the downturn, but this is, as like most other reactions to the virus, short term action still hoping for a rapid return to the "norm". Which will not happen. And the cost to any business of having equipment parked is hideous - and the airline industry in particular has such slim margins of survival to start with. But, and with airlines there is always a "but", this is an industry that is not purely commercial - in that flag-carriers can get (often?) an extraordinary level of support from governments to help them not fold. National pride, whatever - they get support to stay alive more than most industries.
So what does this mean specifically to your question? I think that airfares will have extremely favourable discounts over the coming 2 to 4 months (here I am really getting into the fine print with my crystal ball) Perhaps an indication of this is the recent appearance of stellar value Aussie - USA flights in economy. There is a reason why Qantas are offerring such wonderful prices without first doing a huge marketing game - they are desperate. I think that QF, as many airlines are, are very competent in their strategies. We on AFF are amateurs. So they will do things in stages. First up they are quietly releasing cheap Y fares. Simply to try to lock in advance purchases by tourists. At these prices the cost of cancellations is a major proportion of the cash value itself! A DSC promo now is great planning - again trying to lock in customers despite the unknown of the future.
Next will come real price drops on the premium cabins - so far delayed as at yet, without Corona being a confirmed pandemic, many affluent or business travellers keep doing what they have to or want to do. But each day, as the virus becomes more of an issue, these travel patterns will also decrease. So in the next two to four months, prices will drop. Airlines simply cannot just keep parking up aircraft - this is a lurk that can only be doen for a month or so before the overall economics and staff issues force them into a reality that no airline wants - real and complete downsizing. It is a bit like a sheep farmer in Australia with drought - you cannot simply halve or decimate the flock, then bounce back the next year - it takes time - much time, to regain the numbers when things eventually improve.
But the window of cheap airfares will, IMHO, be fairly short - a month or two. Because once Corona is truly international, and every one has it, there is suddenly a point reached where travel restrictions are meaningless, and the airline industry will return to approximately "normal". No point cancelling an intended trip to Wuhan if you are catching coronavirus at your local 7-11
There will be an ongoing and slow-to-dissipate period where the sheer pain of this virus keeps people spending less - due to being sick, the general economy/share market etc still being in a low period. And this could help keep airfares down for a while.
At the end of the day, or rather my crystal ball consultation: expect some really amazing offers on international travel over the next few months.