When dealing with the “outside in” aspect, of the open innovation process, one has to be mindful of the incentives of the external source. Clashing incentives may lead to complications which are more difficult to solve than if the innovation is carried within the organization. As with any process, the more complex its components the more difficult it will be to manage.
With the specific point of people having a restriction to the innovate, I would say that my concern with this open trajectory is succumbing to external forces (due to overpowering outside incentives) that may lead to herding behavior and silence possible revolutionary innovations from within a company. Sometimes isolation leads to out of the box thinking.
My approach would be to have a balance of closed and open innovation processes.
See Dahlander and Gann (2010) who writes about different types of openness.
Some important open innovation variables connected to openness that I found interesting: the transparency of the innovation process, incentives to participate in the innovation process and how to arrange and protect IP rights during the innovation process (also for the resulting innovations); these things will have impact on how people participate in open innovation.
Dahlander, L., & Gann, D. M. (2010). How open is innovation?. Research policy, 39(6), 699-709.
Very interesting and valid question and set of answers.
Perception of top management, organization culture, and mid-set of employees may be considered important and further researched for various industries.