Too big

I have a hypothesis that size kills innovation.  Innovative companies get really big and then they stop innovating.  How can this be prevented?  What if when a product reached the life cycle where it was no longer growing, the shareholders sold the business to the consumers?  In this way, they would capture the full value of their original innovation while not losing the ability to continue to innovate.  So this brings up the question of how consumers would own the business?  A co-op?