The Microsoft co-founder even talked about what governments would do to prevent social unrest because of the mass unemployment, where he said they should basically get on their knees and beg big businesses to keep employing human beings instead of robots. This could lead to a future without payroll tax and corporate income taxes, while keeping the minimum wage low enough that businesses continue to employ people cheaply, versus using an automated, never-sleeping, non-demanding robot.
Most people think that robots will just replace the lower-end of the job scale, such as "low-skilled" workers, but it will effect virtually all industries. Even high-paying, and high-skilled jobs like accountants, commercial pilots, astronauts, police officers, and much more could be replaced with AI-based robots.