Its as if you guys never played another MMO.
I have never seen a support class hurt dps of a group, only add to it.
This isn't hard stuff to figure out, bards in almost every game are a support type class, and in every game/raid/group I have always welcome them, because while their own dps maybe only 3/4's a different dps class, they boost all others dps by 1/4 or more, along with other possibly boosts. It more than makes up for their lower dps, the only other option here is to have a cut/paste of our current dps classes and just give them a new name/weapon....but if in effect they do exactly the same thing that would be boring and redundant.