I do wonder if the travails of Boeing are, in essence, the long tail of neo-liberalism.
Given that much of the commentary seems to trace the problem back to the McDonnel-Douglas merger, and the switch from being an engineer-run business that happened to make money to being a money-making business that happens to do some engineering, I wonder if it's not just another example of the shift towards an obsession with share-holder returns that began in the Reagan/Thatcher era? It just took a long time to start having noticeable effects in the aerospace sector, because there's so much inertia in that sector.
I mean, a lot of the bad effects of Thatcherism/Reaganism seem to have taken a very long time to become apparent (our water companies going bust, the rise of both China and Trumpism...). Maybe the decline of Boeing is just another one of them?