If scarcity only ended for consumer goods, people would still have to work (most jobs are currently in the services economy).
I'm not sure that follows.
If the price of consumer goods and basic necessities of all types fell to almost zero, but we had large-scale technological unemployment (most people don't have a job and thus have little money), I would expect most people to just stop paying for most services and just do them for themselves (or for their neighbors, whatever). Which would then eliminate more service jobs, and so on.
You could easily get to a point where much or most of the mainstream economy just ceases to exist.
If the price of consumer goods and basic necessities of all types fell to almost zero, but we had large-scale technological unemployment (most people don't have a job and thus have little money),
You are assuming that most people wouldn't have a job. I think most people would have jobs if scarcity only ended for consumer goods. We would still need plumbers, teachers, lawyers, cops, firemen, soldiers, doctors, investors, scientists, etc. The scary part is when AIs can do those jobs as well.
Kevin Drum has an article in Mother Jones about AI and Moore's Law:
Although he only mentions consumer goods, Drum presumably means that scarcity will end for services and consumer goods. If scarcity only ended for consumer goods, people would still have to work (most jobs are currently in the services economy).
Drum explains that our linear-thinking brains don't intuitively grasp exponential systems like Moore's law.
He also includes this nice animated .gif which illustrates the principle very clearly.
Drum continues by talking about possible economic ramifications.
Drum says the share of (US) national income going to workers was stable until about a decade ago. I think the graph he links to shows the worker's share has been declining since approximately the late 1960s/early 1970s. This is about the time US immigration levels started increasing (which raises returns to capital and lowers native worker wages).
The rest of Drum's piece isn't terribly interesting, but it is good to see mainstream pundits talking about these topics.