Because in 50 years AI and Robotics will have advanced to the point that 99% of jobs within society will be taken over.

This will lead to two different outcomes.

Under capitalism, the 1% of the population will own these automatons and live within their own world, just as they do now. All while the other 99% now devoid of jobs will continue to decay and rot. The remaining jobs will all be exclusive to AI and robotics workers who will still he paid on a salary basis while capitalists aquire all the profit. Birth rates will plummet just as we see now, and humanity will collectively suffer.

Under socialism, society will collectively own the AI and robots, and the robots will work for us and create heaven on earth. Freed from their jobs, humans will be able to pursue hobbies and passions rather than having to work to make society function.

China has the most automated industrial sector in the world and are losing jobs to AI and robots faster than any other society on the planet. They know that without socialism they will collapse and face perhaps a millenia of humiliation. Companies like Huawei are worker owned and the workers receive their payment directly from the companies earnings rather than a fixed, unrelated salary.