Elon Musk, speaking at the Future Investment Initiative summit in Saudi Arabia, predicted that by 2040 there will be at least 10 billion humanoid robots, priced between $20,000 and $25,000 each. Musk suggested that the number of robots could surpass the human population by that time, potentially making Tesla a $25 trillion company. He also indicated that AI and robotics could soon become Tesla's main revenue sources.