As one who has been involved in the aftermath of a number engineering failures, my take is that once it is airborne the Max 8/9 will be the safest aircraft in the air. Engineers don't like to be wrong twice. It is highly unlikely that the ones who are fixing it are the same ones who screwed it up. And unlike the original designers, the fixers will have an unlimited budget, unlimited resources, and apparently an almost unlimited schedule.
But of course, the cynical public won't listen to that.