This is not for a fix from scratch. This is what they have been working on since the Lionair crash.
The question is whether it will satisfy the regulators (worldwide not just the FAA now) now that the second accident has happened.
The real question is not: Does it satisfy the regulators: FAA is effectively a Branch of Boeing. Whatever Boeing deems satisfying will be for them as well..
The real question is: Does it reliably prevent re-occurrence.
Another MCAS crash will definitely finish off the MAX and possibly the whole Boeing. I hope stupid short sighted Managers won't kill this legendary plane maker.