True, There are weak and strong unions Disney's unions are weak unions if they were represented by something like SEIU, DL and the Media properties could find itself picketed because it's the same company, Just imagine Disneyland with a few of the giant inflatable rats outside and some tough characters blocking the entrance.
RTW means they can't force the CM's to join the union, If SEIU were to represent Disney workers and they called a strike and Disney sacked the CM's it would be a PR bloodbath, Horrible optics.
More and more we are seeing a return of the same labor relations which spawned the unions in the FIRST place, Santayana was correct those who do not learn the lessons of history are doomed to repeat it.