> There is no such thing as “scarce workers”. The problem is scarce salaries.

Well, yes, and the point is that workers are more scarce at any given salary than they used to be last year, or in the last decade, etc. At the same time, robots get more affordable. Isn't that the reason why employers want to automate as much as possible?

It's a question of how quickly the robot can pay for itself and provide a return on investment. Whichever tasks can be performed by robots will likely be automated.