People lose or gain a job at every change at WDW, down to every menu change at a QS place. Quite apart from the fact that changing jobs or job functions is normal reality for everybody else too, and not just for temporary jobs at temporary parades, why take it up with the very people who support all these jobs by working all year long to spend their money to pay for these very jobs.
This show was possibly the most useless and obnoxious parade ever. I have literally fled the MK, waiting thirty minutes outside the gate staring at my shoes just to avoid this loud monstrosity ruining my entry into my beloved MK.
I agree with you that it would be terrible to see CM's lose their jobs, but if they are in good standing with the company, I can't imagine they will be fired. I could see them getting new positions within the company.