Samurai!?

[C-croft]

It would have to branch off something that isn't MRD or GLA because it would play too similarly to Warrior or Paladin, respectively.

My personal preference is at least Dark Knight or Samurai as a tank class. The one not chosen to be a tank class should be the DPS. Or, what the hell, make them both tank classes.

Increasing the amount of tanks available in game will only temporarily boost the amount of active tanks in game as they level to check it out. Once they are done or decide they don't like it, we will be right back to the same ratio. I do see SAM as a tanking candidate, though. DRK, I would see as a DPS.