That's not the point. There are tens, maybe hundreds of thousands of aspiring singers that would love to sing on Broadway. There are probably an equal number of talented designers and Disney fans that would die to be an Imagineer.
That doesn't mean Broadway singers or Imagineers should make minimum wage just because they're easily replaceable, and they could find someone to work for that much. Those are challenging jobs, and the people that work them should be compensated accordingly.
Being a Disney cast member is also a challenging job. You must deal with difficult guests, who may speak many languages, in a fast-paced and hectic working environment, to Disney's high standards of etiquette and professionalism, all while keeping a smile on your face.
Being a Jungle Cruise skipper is even more challenging. You must do all those things, while being stared at by a boat-full of people staring at or filming you, and then try to get them to laugh. All while operating a boat. Backwards. In a job that doesn't provide a single moment of air-conditioning, even in its breakroom.
They deserve much more than minimum wage.