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I doubt that the wing has much more development left in it to permit it to keep up with the developmental potential that the Airbus has. Tying an extension of the time to conclude the 7 and the 10 with a termination of any further grandfathering of that aircraft would be a win in the short term, and a win long term, as TBC needs to be producing a replacement airframe that can compete with the Airbus.
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IMHO this is the most likely outcome. Give Boeing an extension to finish the Max7 and Max10 as-is, and that's the end of the line.