If AI can truly reason and build complex applications - I.e it has mastered composition and causality, then AI would have a full mental map of how commercial and residential buildings work.
How every pipe fitting links to each other. In that case plumbers aren’t needed for small things since a user could state their problem to a smartphone and AI could guide them to the correct fix as it debugs the users house.
Same with construction or doctors or teachers.
If AI can truly learn and reason the physical world, then it doesn’t mean much to be human.
What is being a human in terms of labor? A 100 watt 80kg biological agent with general intelligence that can learn and follow steps. With eyes and ears they sense, with legs they move and and with hands they apply fine motor skills to move other objects.
The whole point of AI is to build cheaper labor that follows instructions, never sleeps, never forgets, replaceable if broken.
The rich and powerful will 100% get more rich and powerful, the question is how well that prosperity will be shared with the rest.
It could be that some powerful nations say let’s go kill entire other continents and take their land with our robot and drone army.
Globally 35 billion barrels of oil / yr are consumed. Thats 1700 kWh/barell * 35B = 59.5TWh/year = 6.8 TW. This means if someone could make human equivalent robots that take gasoline as energy, they’d have an army of 68 billion human-like robots.