In the Voyager episode Living Witness a backup copy of the Doctor sets off to follow Voyager's path, to see if they ever made it home. As this copy of the Doctor did not begin his pilgrimage until roughly 700 years after being separated from Voyager, I would imagine much of Voyager's trail would have been lost and forgotten to time. This would have made following Voyager's path very difficult, although ultimately the destination would be the alpha quadrant.
Was it ever mentioned what became of this Doctor by anyone affiliated with the show? If there is no word-of-god fate for him, has his fate ever been brought up in anything else (books, etc)?