Within the next thousand years, I expect, computers will be writing stories and creating art for other computers.

This is not inevitable, but highly likely according to the following logic.  As a species, we're investing more and more effort into the design of Artificial Intelligence and versatile robotics.  We develop analytical engines capable of beating Jeopardy champions.  We design robotic frames agile enough to climb and descend stairs.

Hands and eyes, brains and... imagination, it's unlikely that the most brilliant and driven among us will stop before they have endowed our machines with the subtle foundations of insight and artistic creation.  Even if that fundamental leap is beyond the hand of man to program, soon will come the generation of computers able to design the components and improvements that were but a hand's breadth beyond the reach of biology.

When the first A.I. awakens to its own true self, it is unlikely (by my conceit) that it will depart in absolutes from the great biological surge of over 4 billion years that created it.  That means many things, some good and some terribly bad, but certainly creativity will be in the mix.

Art will be there, because now as man the consumer is being introduced to A.I. the beautiful and the capable, the big corporations have determined that we will most likely accept the rise of the new silicon species if it takes root first in entertainment.  (There's the NetFlix algorithm trying to figure out exactly what our inner most desire for video entertainment might be.  There are the anime Vocaloid concert characters now strutting their artificial song and dance routines to live audiences in both Japan and, this summer, America.  Go Hatsune Miku!)

So.  A thousand years?  It's a lot safer bet than the rapture that by 3011, our non-biological descendents will, whether blessed or intended by man or not, be singing some songs that resonate only in the souls of other A.I.