Yes, I think there will be real value in this. Not only will it allow us to get content managed (for end users) in the correct way, but will have a considerable knock on benefit in terms of the cost of managing the data. You might apply a stricter/more robust backup and recovery strategy to legal documents for example than for internal team meeting powerpoints, and so can face different costs for managing these different content types.

Also, presenting the subject more in a Knowledge Management context than Collaboration, the key to success will not be retaining all the content, but retaining it in a user friendly, discoverable and retrievable manner.

There are several vendors, including the big data storage companies with interesting roadmaps in this space, so I am sure its a subject we are going to hear more on in the coming period!

Its worth remembering though that one of the benefits of collaboration is that you aim towards storing a single copy of a document (with version control) rather than multiple slightly different copies across your IT estate. This is where the real savings are to be found.