Boeing and Airbus will survive in one form of another. The Chinese perhaps pose the most serious long term risk for them . There are other manufactures coming on line as well.

It is my hope that Boeing and Airbus will not have to eventually manufacture in Asia to survive. I even wonder if composite components will eventually prevail in large commercial aircraft production. They are currently being used to some extent. . The Dreamliner comes to mind.

I do not know much about jet engine failure. I never have heard of the fan and shaft departing an engine before. Although at the rpms that fan operates at any problem causing a serious imbalance could tear even the shaft bearing supports out I suppose. The inertia forces could be massive.

Probably does not make the current operators of that series of engines all too happy. Especially if the actual cause cannot be identified. There may be too much evidence missing to ever really know. Also may be a reward for locating the remains of the missing components. That does not mean they will be found for certain. If I remember properly it was a really long period of time until a farmer found a whole jet engine that fell off a plane years ago. I think the reward was about 50K for anyone finding it.