I don't believe this, and I don't believe any reasonable value for "many people" do either. Most people are not vegetarians or vegans. Most people do not hate zoos. Most people do not hate farms. Most people do not take offense at the keeping of pets.
Captivity is a great example of human ingenuity and dominance. It's good for everyone, including many of the animals that are kept captive.
>In the future, human animals will look back with revulsion at the way we currently treat other animals.
I totally disagree. Humans have not yet developed this type of serious revulsion on a macro scale, even though animals have been kept captive for thousands of years and across all human cultures.
If you want to say some of the extremes of captivity are inhumane, then great, you'll get no argument from me there. But I fundamentally disagree with anyone who believes that captivity as a whole is improper.