I think the damage to Boeing if they are forced to cancel the dash 7 and dash 10 variants due almost entirely to Boeings inability to get their shyte together, is not that significant. There has been almost no take up for the dash 7 because a dash 8 costs virtually the same to operate and carries more pax and the dash 10 has been buried by the 321LR and XLR. The only way they are selling any dash 10's is with a huge discount.
This is an opportunity for the FAA to draw a line in the sand with Boeing. No more same old same old with the minimum cheap and nasty solution to everything, they need to meet the standards imposed 2 years ago or no FAA certification; full stop
The senior management of Boeing still thinks that spooling up their lobbyists, instead of their engineers is the preferred response when the FAA tells them they need to step up. They need to be disabused of that notion and Congress has got to support the FAA, not the company that caused the deaths of over 300 people because they were too cheap to properly design the MAX upgrades and then lied to the regulator about what they did.