How Relevant is the Studio>Gallery>Museum Model Today?

When reading Carrier, I began to question the relevance of the studio to gallery ~ gallery to museum model. I'm not entirely sure that today the gallery or "middleman" is as necessary as it was in previous years with regard to being shown in museums. For example, the Guggenheim is in the process of curating The World's Most Creative Videos exhibition via YouTube. Also, I'm not altogether sure that the ultimate desire for artists today is to be shown in museums, especially since there are so many public forums available.