Even if the FAA recertifies the Max there’s a number of other countries that are signaling they will never certify these planes for service.
Seriously, the reputation of the Max is now the thing that is not salvageable and Boeing should simply cut their losses and come up with a new design.
Talk about throwing out the baby with the bathwater.
Do you have any idea how long it would take to bring a clean-sheet design from the drawing board to certification?
For reference, the 787 Dreamliner, Boeing's last clean sheet design, took from 2003 to 2011 to be fully developed and certified, and was billions over budget. Boeing has so far built just over 900 Dreamliners, but is not expected to break even until aircraft 1100.
The original purpose of MCAS was to address a handling issue in a narrow regime of flight, and was a sound concept. The implementation of MCAS with its lack of redundancy, lack of sensor failure detection, and a poorly executed last minute increase in MCAS scope and trim authority have been the disaster.
All of those concerns have been addressed, and are in work to be certified. Once they are certified, by each country individually, the aircraft will go back into service.
Perhaps you don't recall the problems that Boeing had in developing the 787, including in-flight lithium battery fires and engines that self-destructed during testing.
Nobody knows or cares about those problems today, because they were addressed, corrected, and the flying public happily step onto 787s every day.
The same will happen to the MAX. With the 737-NG still in service, the average flyer may barely realize s/he is on a 737 at all, let alone if it is an NG or a MAX.
All the flying public cares about are $79 tickets to Orlando.