Haha you are dead wrong about people having less jobs than before. There will always be jobs that require more adaptibility, finesse, sophistication that an AI can never have. If AI and robotics leads to more prosperity, then it will also lead to people having more money. How will they use this money? For more services that makes their lives easier or induges them. So, more entertainers, more sophisticated service, more prostitutes, more massage providers, the situations are endless. People with money will even hire servants just to make life even easier. AI can never do those things.
When people were poor and just worked in the fields, A job like Sommelier didn't exist, whose only job is to recommend people what wine to drink. But now its a very lucrative job. The more money people have, more types of specialized job will appear, that only humans can do. There will never be less jobs.