You're right, RIM should try this to fix their stagnation in designing, innovating, marketing and especially managing. Too many 'Uh-Oh' moments that shouldn't have happened.
I think RIM currently does use committees to design. The problem is that they use a model tried many years ago. A large group of people collaborated on building a tower. It was to be the tallest tower ever, with the expected result of it reaching to Heaven.
Because of external influence, the people lost the ability to effectively communicate with each other and the project was a failure. The tower was located in Babel.
RIM reminds me of this because I think the various departments are unable to coordinate and that there is little to no communication from on high to those departments (design, marketing, etc)