Why would Boeing announce, in a time like this, that they are closing down a production line? Especially for the 747?
Just let it take its course. Media manipulation (social engineering)
The fake news is all over this, further reducing Boeing's stocks.
They will not announce it, until it's time. Maybe, as the entire thread posits, there is an influential faction within Boeing, believing that the fat lady has not sung yet. Quietly searching for orders and business case to continue.
Or maybe it's really over, and then there is incentive for the management to keep it for the "D-Day", when a slew of announcements is due:
"Company planning for a fresh start, with new direction, and laser-focus on core products, innovation and shareholder value... bla-bla", with some "Project Above and Beyond" announced, together with "cutting of deadwood", etc.
Now is too early for anything like this, as MAX is not out of the woods yet.
On the other hand, if they announce killing 747-8 now, it will be a sign of weakness -- "Boeing has lost another jet in its product lineup", etc.
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Ceterum autem censeo, Moscovia esse delendam