The 737 will clearly continue on - too much in capital investment to just throw it all away. But the future will not be the 737 MAX. The future will be newer and more efficient designs. In retrospect Boeing tried to get one too many models grandfathered under the 737 type and it’s going to cost them money and credibility. They HAVE to come up with a new competitive narrow body and that relatively quickly or Airbus is going to eat their lunch.