Much to my dismay, but not to my surprise, Myst Online: Uru Live is going offline, due once again to financial issues and most likely, lack of subscriptions.
GameTap has decided to discontinue the operation of Myst Online: Uru Live. Although Myst Online: Uru Live will be completely shut down in the near future, the game servers will remain live for the next 60 days. During that time, both newcomers and existing players can continue to experience the amazing world of Myst Online, explore the gameâ€™s many Ages, and interact with other players in the game and on the MystOnline.com website and forums. After 60 days, the title will be removed from the GameTap service, though MystOnline.com will remain live and active for fans to continue to share their passion for this important game franchise.
Source: GameTap Forums