We can no more justify using nonhumans as human resources than we can justify human slavery. Animal use and slavery have at least one important point in common: both institutions treat sentient beings exclusively as resources of others. That cannot be justified with respect to humans; it cannot be justified with respect to nonhumans—however “humanely” we treat them.
And as an actor - or even as a person in the industry - if you're unwilling to change, you're just going to get swamped. You've got to be flexible, and you've got to go with the flow. That's what I try to do as an actor.