If rDPS is skillfull and MCH can't be brought to BRD/DNC level, bring back rDPS?
Rework wildfire to take in account every teammember attacks and stick a cap to it?

Bring back dismantle and give MCH some defensive utility?

Give something that helps MCH to compete with the other ranged.
DNC can compete with BRD thanks to its healing. MCH simply is there, doing its best.