Well I'm calling Turbine on this, the issue with Wail of the Banshee' isn't just some inconenient bug that's a bit too complicated to revert to a working state. This is an intentional stealth nerf of casters, with Turbine hoping that any sort of protest will be diluted and neutralized by the smokescreen of waiting and speculating over whether we will get a response or fix. This issue has been allowed languish for weeks so far without any serious response.
I think Turbine have gotten into a habit of arbitrarily making changes to the way things work, to guage how badly players might react to a more rigorous and DDO store oriented buff/nerf cycle version of DDO, as they plan how they can make the most money out of DDO going into the future. They are seeing how cheeky they can be with unannounced modifications of game mechanics, hoping that any protest and outrage will be muted through the confusion and bickering that usually follows on the forums.
Ultimately the only way to punish this sort of thing is withdrawing custom.