I think that a Shadows of Angmar server or 2 should be hosted, with completely different information in them than what is currently in-game. It would take the game back to just before Mines of Moria was released, so any minor updates that happened before it would be included, but the point of it would be to bring back an old, and frankly, more challenging game, more focused on a fellowship feeling of the game. A lot of people really enjoyed it, and for that reason a lot of people left when the game became more soloable and took away from the big challenges. Area and class revamps have been done to make lvling easier or classes more powerful and less squishy, which isn't necessarily bad, since it's conforming to the new cap lvl, but I feel like now the cap is easier to master than it was back in SoA. Crafting has become extremely easy; most instances and player's roles have too. I personally liked the challenge and am sure people would play on a nostalgic server, both to experience what the game used to be like, and also to go back to play it normally, playing a way that they may have preferred. It would bring back old players, and therefore might inspire them to check out the current game in addition to just the old version they were used to.
The hosting server would really be the only cost. Turbine should have a backup of SoA server files, so it should be easy to set one up. They could include the SoA server for free to VIP players, and charge like $5-10/month for other players, but they would not have access to the RoR servers, they would have to pay the full VIP price for that. Also, F2P might not have access to the SoA server. The server would not have any Turbine Store or anything that has been introduced since the MoM expansion. That would mean people who go back from the current version would not be used to having LIs, or advanced traitline boosts, and a lot of other things, but that is what makes it so fun, not being handed end-game things that can be upgraded/replaced without a group. Turbine would never have to touch the server, unless there were a major bug or something, so it wouldn't distract them from upgrading the current game, but it should bring back old players or give current players a chance to play an old version, and give people still playing since back then the ability to go back and enjoy the game from back then if they so choose.