an auto-reraise wouldn't have to be Reraise III. It could be a Lv95 or 99 trait, be Reraise 1, and give 70 levels between learning the first Reraise and getting it as an automatic trait, making it useless anyway from Reraise II and especially Reraise III.

I don't understand how having a Reraise trait would keep WHMs from casting anything but Cure. All it would do is keep WHMs from using the MP to cast Reraise if they're fine with whatever xp loss they would get over not having Reraise III up. Any whm that doesn't keep Reraise up... well, far be it from me to judge, but that in itself is just lazy.

I like the idea! I would like to see it ^^

EDIT: Not to mention those times where you're in the heat of battle, things are going annoyingly bad, you're focusing on curing party members and healing status ailments, and your reraise wears off in the midst of all that and you all wipe. It'd be nice to have a backup.