You can't fix a culture developed over 20 years (at least not fast). Especially if its a culture seen as good and beneficial by everything that surrounds you. Let's face it: the culture problems at Boeing are only a sign of the same problem everywhere.
If fixing culture is a prerequisite the MAX will never fly again.
Yes, MCAS is a pernicious and deadly design.
Equally, Boeing's corporate governance and FAA's regulation and oversight are also "pernicious and deadly".
All must be fixed before this aircraft flies again.