What is this "human nature" that supposedly makes capitalism the only possible mode of production? Human nature somehow requires the dictatorship of the workplace, the exploitation of human labor, and the exclusive necessity to organize human production around the pursuit of money? What do you think is going to happen to your beloved capitalism when wage-labor is replaced with technology?
Capitalists and their fans resort to cheap polemics when they assert that socialism doesn't work. Their standard for success is quite disingenuous and arbitrary. Success for one nation is not the same for another. If a nation begins with practically nothing and a few decades later becomes the second-largest economy in the world, rivaling a powerful hostile capitalist superpower that had more than a century's headstart, how can you with a straight face assert that was a failure? By what reasonable metric do you dismiss socialism as a failure? The facts are that when socialism is allowed to function without being attacked by capitalist-imperialists, as occurred throughout the history of the USSR and other nations like Cuba, Vietnam..etc, it does very well. Socialism is not communism, it's the process of socializing production from capitalism to communism.
Your demand that socialism must take over capitalism overnight, within just a few years or decades, if it is a viable economic model and mode of production is absurd and silly. Capitalism didn't replace slavery and feudalism overnight. It was a long process of trial and error, successes and failures, victories and defeats before the capitalists beat the monarchs and feudal lords. The merchants and capitalists didn't defeat the kings and nobles overnight, it took centuries. A few hundred years ago the proponents of slavery or feudalism were resorting to the same bullshit arguments that the fans of capitalism use today against socialism:
" Oh capitlaism doesn't work. You guys were defeated by the kings and nobles. Your economic system just doesn't work as you can see. Human nature demands slavery and absolute monarchy. Feudalism is the best we can do now and forever. Capitalism is nothing more than a pipe dream. It will never happen, because human nature won't permit it. Workers have to be enslaved by a master and driven by the whip. That's human nature."
Really? No. You're essentially applying the same faulty logic and arguments against socialism and communism. It will become quite obvious in the near future, that socialism (the socialization and democratization of production) will be the best, if not only solution to the elimination of wage-labor by technology. The capitalists might try giving people a Universal Basic Income to maintain capitalism on life support a few more decades, creating a fake market with fake paying consumers, but that won't last too long. Production will be forced to re-organize itself, not for monetary gain but for the sake of meeting the needs of consumers. Consumers will always exist, PAYING consumers won't. There's a different between paying customers/consumers and simply people who need to consume (eat, clothe themselves..etc). Production will be for the sake of producing what we consume, not for the sake of private capital accumalation or profits. Monetary gain will no longer be the "bottom line", it will be meeting people's needs. Our "bottom line" will change out of necessity.
NO WAGE LABOR = NO PAYING CONSUMERS = NO MARKETS = NO CAPITALISM.