I just want it to have more music. Whether that comes from animations or a job split, I don't care.
If they split, I would love a full-fledged Ranger focusing on traps and bows, lorewise being an anti-poacher and seeing the Animals command return from FFV in order to have a fully musical BRD. A fully musical BRD could be an interesting ranged, healer or caster.
If they stay combined I'd love for all oGCD buffs to be songs when the soulstone is equipped (Raging Strikes for example). Having music notes and stuff appearing as aura visuals (gently, not big in your face) for our song stances would be nice too - it would add a musical feel to the job and show where to stand for DPS that go too far.