True, I don't think anyone denies that, but all the author is doing is asking people (particularly those people who believe in a one world utopia) to imagine the consequences of such a world. Nothing wrong in that, eh?
Imagine, if you can, everyone with the same dresscode, everyone with the same amount of wealth, everyone with the same degree of education, everyone with the same political persuasion, everyone with the same athiestic view of life.
Imagine Communism.