Another tanking class would be great, I'm not going to lie. I also think there should be more classes of all types of roles, including healers and damage dealers, but I also think they should come when the timing is right and when there's a need for it, and to keep the game fresh. This is not the time for a new tanking class, I don't think. If anything, perhaps another ranged physical DPS class, since it's the only type that is behind in numbers. However, I also subscribe to the theory that classes should be introduced in pairs or more (tank + caster, healer + melee, etc.) so that the numbers aren't skewed too much in any one direction only to be flipped about when players ultimately return to their original main class or what their guild needs to fill in.