Mostly agree, however I think Boeing should be required to engineer an approved and deemed safe remedy by a panel of experts comprised of international regulatory engineering staff deemed to be experts in this field.
The cost would be the greater of the approved solution or the envisioned cost of correctly re-working existing airlines. (The cost savings might come from a factor of cost not considered here, Boeing's liability to airlines for downtime of units or inability to sell new planes.)
The cost would be the greater of the approved solution or the envisioned cost of correctly re-working existing airlines. (The cost savings might come from a factor of cost not considered here, Boeing's liability to airlines for downtime of units or inability to sell new planes.)