The FAA will never ban it because politically its untenable in the US, the only thing that could kill the Max off would be if another big regulator such as EASA refused to let the Max into their airspace.
What are you basing this on?
How do you think we would judge someone using common sense to work out a problem in computing? Because saying the FAA is existentially deferential to Boeing is a "series of tubes" analog.
There's literally no reason to ban the aircraft.