Perhaps there will be jobs building these Robots, until Robots are employed to do that job as well.
You've got it all wrong.
The robotization/automation of labor is just the means of concentrating control of the means of production into a smaller and smaller group of people. It isn't that robots allow businesses to replace workers, it's that robots allow business OWNERS to keep a larger share of the profits of their business. The business model for autonomous robots would almost certainly depend on the ability of robot manufacturers to continue to be able to profit from their product; in that case, robot makers will probably lease -- not sell -- robot labor to manufacturers and service providers and collect the wages themselves.
On the one hand, this would rapidly increase the gulf between the rich and the poor and would (eventually) lead to a self-cannibalizing economy that becomes a nightmare for anyone who isn't extraordinarily wealthy. On the other hand, robot labor would tend to give poor people greater opportunities to start business ventures of their own since they can more easily convert an idea into a business without having to acquire or train dedicated workers (they can just buy/borrow/steal robots from venders).
The combination of these two things would probably lead to some kind of epic scifi dystopia. If you think mass shootings are bad now, imagine what it'll be like when pissed off rightwingers figure out they can program their laundry droids to carry assault rifles.
