The thing about supports in this kind of game is: will become mandatory or you will be better off with a regular "real" class. I guess SE can add one more party slot and force a support class in every group, that way a new class could be added and bard/dancer transform into true supports.

Personally, I don't think is worth it. Also, no matter what, if the class do damage people will want that you contribute to the max of your ability.