Do you still have the retained knowledge in engineering to get it back?
Is what you have lost in people recoverable?
Have you had too many years of beancounters and that ilk, to get back to the 90 years of an ingrained safety culture that QANTAS executive have been 'trading' on for the last X years.
It's like a sporting teams Executive that trumpets to the members that we won premierships 5/10/20 years ago, and expecting us to forget that they have done sod all lately. You're only as good as your last Flag/Cup, and you can only trade on that for so long.