With a backlog of over 4000 orders how can it possibly be cheaper to can it? there are tens of airliners that have gone from design to production and sold much less than a tenth of that. 4000 orders is in the region of 200billion, how is that ever going to get canned? even if they had to do a clean sheet design that sort of cash will still make it way more than viable.
AND yes for the last couple of months we do have a pandemic going on but these are projects with a horizon of decades. Several Booms and Busts are unavoidable and expected.