As sad as it is to say, it is statistically speaking, quite likely another MAX will accident/incident will take place in the 1-2 years after it is back on line. There is a back log of 400 aircraft to clear. Once the fix has been approved and applied to each aircraft, airlines will be under pressure to get them delivered and on line ASAP . Things will be rushed and shortcuts will be taken ultimately resulting in other more well known factors to take over and contribute to an accident/incident.
One more accident or incident will be enough to put the final nail into the coffin even if it has nothing to do with MCAS. It will cause another media stir with negative publicity for Boeing and airlines alike. The name has been dirtied. Airlines need to start demanding Boeing rebrand the MAX now and go as far as possible to make it appear to the public it is a different aircraft. Right now that is not a priority but it ought to be as it's the next battle they will need to fight.