I’m not sure a type rating works that way. A Boeing 717 has the same type rating as a Douglas DC-9. The two aircraft have similar airframes and some common syst

I’m not sure a type rating works that way. A Boeing 717 has the same type rating as a Douglas DC-9. The two aircraft have similar airframes and some common systems but are quite different as one was built decades later. What the FAA does in these cases is requires more training. A DC-9 rated pilot who has only flown DC-9s will not fly a B717 without several hours in a simulator. The MAX will certainly fly again. I suspect some form of a redesigned MCAS in addition to more training for pilots will be the end result. The airlines may have to spend some money training but they’ll still be left with B737 type rates pilots who can fly B737NG and B737MAX which is where the cost savings is derived.