What's the Vegas line on when the plane will be flying again? Boeing says their software update is almost ready. However, I find it difficult to believe that

What's the Vegas line on when the plane will be flying again? Boeing says their software update is almost ready. However, I find it difficult to believe that it should fly until after investigations of the 2 crashes are complete and the results from them are used to re-examine the design. That would take a significant amount of time. Then there's the political dimension. Let's say there are Congressional hearings ongoing that are ripping apart the FAA to figure out if they delegated too much and why they missed stuff. Who would want to fly on a plane undergoing that kind of scrutiny? There's also the possibility that the FAA would unground the plane but other countries do not. Usually, much of the rest of the world just trusts the FAA, this is likely to not be the case here. Even if it was ungrounded in the US, who would want to fly on a plane if its not approved to fly in Europe?