Yeah, that slow is so important you should waste a person on it. Not like a brd would give you the same thing, plus massively faster kill speed from marches. Sch was already considered useless before abyssea, and it is more useful in abyssea than rdm is.
Blms should be defaulting to /sch. You just go /rdm if you need phalanx (pulling for a cleave?) or gravity (never in abyssea).