Ultimately the system used in WoD could be piggybacked more or less to have the same effect. I could be wrong, but I do believe that the system handles all of this client side, which should render it seamless. The limitation may be that those using updated models would need to have the new animations, but those with the vanilla models would never see them.
And I completely agree, and think there's a ton of value in those discussions. There are bound to be technical limitations or logistical ones that people haven't thought about. That's a great discussion to have. But I think it's fair to say that my jimmies, and probably the jimmies of quite a few others, get rustled when people shoot down something without any sort of reason, especially when it wouldn't impact them one iota.And that's the point I was making, that even if we factored out the rage of the #NoChanges crowd... this would be a bigger undertaking than simply switching out some meshes.