Not honoring the terms of a contract which was signed long ago ? This pandemic will not last forever and when this airline calls Boeing to order new aircraft, I am sure Boeing will remember this.
At which point a competitor will be more than happy to accept some business. This is how the world goes round.
No airline should play nice Everyone will imitatate AAB's school of carpet inspection. Both Boeing and Airbus will have to discount and defer just to keep orders. Airlines must preserve cash.
Prior threads had Boeing cash flowing about 20% of the sales prices (actual, not list), so giving up most of the profit as a compromise is reasonable.
Any business that holds grudges is quickly out of customers. In a few years the salespeople will only care about their bonus and will negotiate accordingly. If a particular VP or sales person or team is holding a grudge, they will be rotated out.
The reality is oil is selling for less than the cost to produce it. There is a whole industry flying less. Cruise ships are pretty much docked for 2020. I cannot imagine construction will have a good year.
As another poster already noted, this impacts Airbus widebodies just as much. If Airbus will not discount, airlines will find every excuse imaginable, including AAB's infamous carpet. This is bad for the 777x, A350, and A330 (all types).
The reality is no one needs aircraft now. The world we were in 3 months ago is not today's world. Some airlines just will not be able to accept aircraft for years.
Now is not the time to be greedy. If either Boeing or Airbus tries to be rigid to contracts, the customers will revolt. Unfortunately, this ends well for no one.
Flu+Covid19 is bad. Consider a flu vaccine, if not for yourself, to protect someone you care about.