This excellent TedX talk presented by Crowdicity shows Rob Wilmot explaining the benefits of crowdsourcing.
This talk uses personal experience and real examples to illustrate the power of crowdsourcing and brings to life the power of collaborative design.
Once this scene is set Rob then usefully goes on to discuss the challenges that can be faced when trying to use this design concept. Stakeholder engagement has been the goal for many years so why restrict it to a consultation role? Use the principles of crowdsourcing to get the input of everyone when a project is conceived, rather than waiting until it has already been created.