Well, one problem is that YouTube's whole "Content ID" process happens specifically outside of copyright law. Google will gladly take down videos without actual copyright problems and they actively shield trolls (normally, a wrong copyright claim is a crime), because it means they won't have to go to court.

So, it would theoretically be possible for Disney to continue the Content ID claims, even if they'd lose a copyright claim in court.
Google would eventually tell them to fuck off, i.e. to take it to court, but only if the case is clear enough.