The problem I see with that is, it would format a lot better as the default Null-Status and be a spell cast in target or AoE form by a whm. (Whm would probably get the AoE, we'd get the self target most likely)

Now, I can picture something like a stun-quick debuff that severely limits the damage of a TP move as it's being used, or say, reduces it's TP modifier to 0 or something along that line. But no sort of debuff to address the enemy being able to release nasty status effects on the party.

I have a feeling that sort of thing would be left to WHMs.