Do you dream of a world full of pillows in which you can lie around eating Doritos and listening to drone music all day? Keep dreaming. (Eventually, you're going to have to get up and pee.) Animal Farm may be a specific criticism of one dream—the dream of a communist Russia—but it's also a criticism of utopian ideals in general. The problem is people. No matter how great your manifesto, it can only be put into action by people—flawed, selfish, stupid, and vain people.
Old Major's dream is just that: a dream. There's no way it could ever be a reality.
Although one disaster after another hits Animal Farm, the animals never lose hope that someday their vision of a collective future will come true.