I like to quote Le Guin in situations like this.
"We live in capitalism. Its power seems inescapable. So did the divine right of kings. Any human power can be resisted and changed by human beings. Resistance and change often begin in art, and very often in our art, the art of words."
Usually the people who insist the present system is immutable are expressing a desire than a point of fact, and then usually because they have a significant stake in maintaining the status quo and should have their opinions be taken with a grain of salt regardless.