On that same note: Vimeo does allow download links to the source files (assuming its a distribution format like MPEG4 and not intermediate codecs designed to be used by Final Cut, Avid etc). In the interest of preservation, it'd allow users to download the sources as well, would be more easily viewed (and embeddable).

I do see value in hosting outside of Vimeo/Youtube as the likelihood of having content DMCA'ed is a looming threat.