The three servers with the lowest playercount are Atlantis, Delteria and Classic. Classic isn't as bad as the other two yet, but at least it's something.
Playercount for the past year on
Delteria:
Playercount for the year on
Atlantis:
I think it's safe to assume that both Atlantis and Delteria are dead, lol. It would probably be in the best interest of Graal to remove the servers from the "classic" section of the playerlist and place them under development status to make the place appear less empty and barren. Sadly most servers do not return from development status, but when or if they do they seem to receive better reception. I think it'd either make or break the servers in question if they were moved, and maybe that kind of kick up the ass is what they need.
(All graphs and statistics were provided by graal.us)