Yeah, you're right. I changed my mind, every job should get erase. Maybe dispel too.
No need to go coasting down a slippery slope here. I respect your opinion and value your feedback, I just don't agree with you on this point. I'm not suggesting every job should get every ability, only that saying "giving this to X is bad because Y already has this" isn't a realistic argument anymore given the current state of jobs in the game, with abilities being cross-pollinated across many different jobs.

Oh for crying out loud...NIN is NOT a mage/support job, it does not need this, if you want erase that badly, sub dnc, this a stupid idea. almost as bad as people asking for a "cure ninjitsu" i'm sorry to be blunt, but let's be serious here. You're asking nin to be way over powerd, hell let's give them a raise ninjitsu while we at it.
Ninja is very much a caster/debuffer in addition to being a melee DD. It has Slow, Paralyze, Blind, Poison and Elemental Debuffs. It has Blink, Invisible, Sneak, and now higher level spells such as Attack Down. Being a debuffer means that Ninja can act in a support role. The fact that the player community finds more use in Ninja as a tank/damage dealer doesn't mean Ninjas can't operate as debuffers/nukers.

I understand that it may seem like this would make Ninja overpowered, but as others have pointed out, it's nothing Ninja can't do right now with /Dnc. Not only that, but they can cure other people as well using /Dnc, and there are a lot more benefits to the sub than just Healing Waltz. A Nin/War with Kyukaku would lose all of the other benefits of /Dnc, but would have a bit more self sufficiency in low-man situations. For standard party situations, this would hardly change the game at all.

Based on some suggestions I've received here and at other forums, i'm going to amend the original post to reflect the feedback I've gotten. I'll leave the original in strike-through. The major change is that instead of curing status ailments, it will automatically resist certain status effects, sort of like Utsusuemi preemptively protects against melee attacks.