Failing this, what is the likelihood a competitor with old-school Boeing values might emerge to compete, in such a capital-heavy industry?
Airplane travel today is also about 70x safer than it was in, say, the 1960s, on a per-passenger-per-mile basis. Despite Boeing's trouble, plane construction, pilot instruction, and flight management have all done a rather good job. There are no "good old times", at least none better than the present.
There are a few instances of a true turnaround from a company that has lost the plot, but even in those instances it looks like jettisoning large portions of an organization and re-growing it along a new axis.
It takes years to set up the infrastructure, though. They'd need to build up to it on smaller scale things first
0 to narrow or wide body production line is a huge undertaking.