Reducing the number of animals in captivity would also have an effect on us humans. Most of us feed from what we get from them. If we don't have them in captivity, these resources would not be available to us. How do we survive?
Yeah, I know you have talked about we doing all these for our own personal gain and for the fact that we believe we are superior to them. But that's the question, how do we survive?
Everything takes time. We need to find substitutes and increase their level of availability. As it is, many animal products can be replaced but it isn't done on a scale for the whole world. That can change.