Art is not a movement; its a metaphor for a way of life. Whether one looks back to when we lived in caves, to ancient Egypt, to the Renaiscences, or to any period of any century, it reflected its moment in time. It should not surprise us then that Art has become a fad like this year's clothes, or that it sells for exhorbitent prices or that it is out of reach for most of the population, (which also cannot afford the most stylish clothes). Is the artist still painting from his or her "soul" or satisfying aspirations to be part of the elite class? It is now almost the only criteria for success. 

Is art declining as a movement? Is our moment in time in decline?

Art certainly has declined.  It is like money.  Bad money drives out good money.  Some say it is in the eye of the beholder art is all around you or more opportunities fore many more.  What they are saying is that people who have no talent can now promote a lack of ability.  Monkeys and animals win art contests.  Rappers make noise and take the place of true artists.  And it is all around us.  Yes, and people with talent have been lost that our age missed because others can throw paint on a canvas and call it art or say dirty words and take off their clothes and get on the stage or in movies.  We are lost in a maze of non-art.  

 Tom