Sheri, Mark Conroy explained to us on the Voyager shakedown cruise that today's passenger is looking for more creature comforts such as larger bathrooms, closets, and cabins, and they want verandahs. The Song just couldn't offer that. He also explained that there were safety issues that would have to be addressed to bring the ship up to modern codes that would cost an enormous amount of money. Since the ship was already paid for, I guess they could go with lower occupancy rates for awhile. They didn't even fill the ship for those last 3 "swan song" cruises when Dag was aboard, as I recall. Perhaps Seabourne and SeaDream will fill in the niche for people to whom the size of the ship is more important than the physical amenities. Seabourne seems to have a loyal following.
Even the smaller Diamond seems to be struggling, given that they are constantly having 2 for 1 fares when competing in their own markets. As much as I would love to see a new small ship, I don't see any signs pointing in that direction.