They could also use the parade and show performers who dance instead. Kind of like at FOTLK only certain roles (singers, the two birds, gymnasts, and fire guys) are Equity. Those animal dancers in the show could learn the other roles. The show would have to close and re-choreograph to lower the difficulty level. Those new performers could lip sync like they do in parades and trolley. It might be difficult to replace the stuntmen and gymnasts, though.What could happen if Disney wanted to call their bluff and still offer entertainment is replace beauty and the beast live on-stage with something like the Pixar live orchestra show. Actually I wonder if the philharmonic will be playing on the castle stage when MK reopens? That would be a good place for them (and reminiscent of the good ole days! Which never went away at Disneyland).
But those changes aren’t overnight. Shows would have to be written, approved, programmed, rehearsed, etc.