For all intents and purposes, capitalism remains as the only economic system on the planet. This focus long ago in the 1840s was obscured by the publication of the Communist Manifesto in 1848, which is noteworthy because we are in great danger of another multi-decade immature distraction. Gandhi taught us that revolution is a child's illusion coming from a limited view of reality.
Evolution is the only possibility.
Because some things are fundamental and cannot be reversed. For instance, all people, as a part of an integrated and cooperative thing called nature, give priority to the good of the whole at all times whether they know it or not. For instance, it is obvious that all the parts within our bodies give priority to the whole body. This is true of all of nature, both the parts inside our skins as well as those outside it. Just as believing in Santa Claus reveals immaturity, believing in opposite fundamental laws of nature reveals immaturity.