BRD has range requirements that already negatively affect its DPS ceiling.
MNK has as high or a higher DPS ceiling than BLM, but a commensurately higher skill ceiling due to positional requirements.
DRG admittedly needs some upward tuning; the devs have acknowledged that.

Rather than rip out the fundamental system that encourages a higher level of player performance, there are better ways to go about balancing things.