Eh, a lot of authors fall into the trap of hand waving the collapse of the current order. But even in a utopian possible outcome such as for example the Federation in Star Trek (who are undoubtedly communist), Earth still underwent a decades long world war of biblical proportions that ravaged the planet for centuries, coupled with climate disaster, unchecked capitalism, and insanely powerful fascist forces. So it is our cause to make sure our fate is not a hand waved conclusion.