I'm not sure how allowing Slow II/Paralyze II/Blind II/Gravity II will destroy balance >.> Most of these mobs have TP-type standard attacks, high Regain, can use moves in quick succession, and typically deal 40~60% damage to use compared to the 1~10% damage we deal to them. Slow II and Para II won't stop a quick succession use of TP moves, Blind II might be nice for the chance of being missed once in a blue moon to the higher eva jobs, and gravity II would go a long way in stopping some of these mobs running all around destroying an alliance with AOE (even after adjustment).
I still don't expect bind/gravity/silence to work on anything even of worth after this....but all the same I'm not seeing the balance upset they are worried about when the mobs we've wanted to use enfeebles on already have a lot going for them offensively and defensively.
Then again, this is SE...anything that is at all like 75 content fights (IE: faf/nid/beh/etc) that doesn't have you running around trying to stay alive is "too easy" and "unbalanced." If I could cast Dia III and kill something instantly..that would be unbalanced..if I could cast Para II and see the VWNM struggle to get a hit in else wise...that would be unbalanced. No one expects this..people just want to be able to cast enfeebles and have some chance at making the fight a little more manageable, not a walk in the park.