Do you believe that art can be willed to not be art?

This is a question which Josh asks in his blog on Goodman.

My opinion, art is art. Once something is declared a work of art by an artist then it should always be art. Definitions cannot be changed just because one person or a group of people do not consider something to be a work of art.
For instance, if someone thought John Cage's 4:33 was not art just because it does not produce sound that does not  mean that it automatically is not art. Perhaps it isn't music as much as it is performing art in the eyes of viewers, but it certainly is art as declared by the artist.