I think you answered this quite well a couple of years ago when you defined art as an occasion or object wherein the excellence exceeds its utility. Therefore the entertainment vs. art is not a border but a continuum. For example Goodfellas and Scarface are good strong entertainment and The Godfather is probably art. Thomas Kinkaid landscapes are perfectly good decoration. Monet haystacks — art.
I think this is an important point. I do still think that's a great, broad definition of art, and one which, interestingly, also includes sports and academia. Furthermore the above response insists that art is entertainment, some entertainment is art. Art is an honorific for the best kind of entertainment.