I can see a company like github or dropbox developing visual versioning and promoting it to make users dependent upon it. It would be an extremely sticky featu

I can see a company like github or dropbox developing visual versioning and promoting it to make users dependent upon it. It would be an extremely sticky feature that made it hard for users to like competing products. Imagine how github could push for MS Office integration and become a versioning powerhouse for non-code-stuff. But I can't see it standing as a stand-alone product that people would really pay for. It has to be part of something else.