Be Clear on What Needs Crowd Sourcing
The question is- what benefits from crowd sourcing? What wouldn't?
The examples pointed out where crowd sourcing doesn't work basically stems from the fact that the example is a technical one. Technical in a sense that the plane requires a specific set of expertise to built and construct for safety. Technical issues such as this should not be "mass crowd-sourced" as this would bring in ideas from "pseudo experts" who might cause more problems that find more solutions.
The only crowd sourcing that could be done with a technical issue would be "selected expert crowd sourcing"- perhaps done through social networks such as LinkedIn where you know you are talking to a group of people with the expertise.
For "mass crowd sourcing", it could be used in campaigns for the environment etc. This is where the collective wisdow would generate innovation and ideas ground-up.
