i don't see us getting a 4th Tank or Healer because of the balancing issues and make these types of classes stand out from their predecessors. we have a blocking tank, Hp tank, and a tank that suffers an identity crisis.... in HW it was going in the direction of invasion, i doubt their will ever be an invasion tank because they will say its OP on how it can cheese TB like many other Tanks already do. for the healers we have a pure healer, shield healer, a healer who can do both and then some, the only option left is a HOT's Healer or a hybrid of shields and HOT's. but if im wrong and we get a 4th healer and tank they need to make sure the DRK/WHM have some type of gimmick that will make players who love these jobs happy before they bring these new jobs out.