Before their buffs, Dragoons and Black Mages were often side lined from raid groups, in place of Monks and Summoners respectively. So it was only fair that they got some buffs, to level the playing field a bit.

But Bards aren't really outclassed by anything directly; the benefits they can offer the party are unique, and pretty much all raid groups will bring one along. So its a little difficult to justify boosting a class that is already top tier!

And besides, while Bards DPS may be the lowest on paper, on many fights the gap is narrowed considerably due to the others losing more DPS while they dodge attacks or handle the mechanics.

I think if Bards do get a DPS boost, Id like to see this via some positional attacks or combos (Point blank shot > Repelling Shot > Mid range shot, for example!).