That's why I suggested they're changing it to 30ARC/15PGL+ACN. ACN's Resurrection in battle isn't tied to a trait, Virus will lower incoming damage and parry/block values should enemies get them (at least good in PvP), Eye for an Eye will also lower incoming damage, Physick to toss a crappy heal, 5% HP Cured buff to party from PGL. Would be entirely support focused as far as cross class is concerned but could drop one of them (Physick) for Inernal Release if you need/want more DPS.
They're changing what cross class abilities can be set by BRD.
They could still get by with 4, the loss of DPS will be sad but we'll still be able to deal respectable damage, just lower burst damage. I agree though that I would prefer 5 so there are 2 people to use the DPS LB instead of just 1 (or sometimes 0 when you get 2 BRDs currently, ugh).