^Agreed. Beyond that, the idea that this opens the door for copycats is ludicrous. The stars would have to align for someone to pull off filming like this again, and, beyond that, there would have to be a "payoff" for them.
Moore's payoff is the career publicity he's getting for doing this, as he knows most distributors aren't going to touch the film. Filmmaker #2 isn't going to get that same publicity since it's now "old news." They also aren't going to get the film picked up because of the uncertainty for litigation.
Disney's best move is making a quiet deal that gives this film a silent death. Taking this to court opens the door for legal precedent unfavorable to Disney that could negatively affect Disney in other ways.
Despite that, I still suspect Disney will litigate this on the IP front.