Restarting the line isn’t as easy as one might think. Boeing is building the 767-300ER freighter and it has the tooling for the passenger model. Boeing has several challenges to resolve before any green light for the restart.
There is a space problem at Everett, where the 767 is assembled.
Restarting the passenger supply chain is an issue.
And, as ever, so is cost.
Does Boeing simply restart the line without upgrades, or are upgrades included, which will increase the cost to produce the airplane?