When?

At least not till the expansion after Dawntrail... if at all. They already confirmed the roles of the two jobs that will be added, which are Viper (melee DPS) and a casting DPS job.

Though the sound of your complaint seems to be bow aesthetics, to which I recommend doing a better look at the various bows in the game, and select one without a harp. The Diamond Bow from Omega Sigmascape Savage is a personal favorite, but there are many others that don't have a harp on the bow.