You are looking a long, long way out when you are talking about those levels of robots building and repairing robots, including to the level of obviating the need for doctors and other medical professionals.
Also, a good part of why the low-skill service jobs are cheap is because we have taken in 10’s of millions of low-skill, largely illegal laborers. This has both pulled down wages via competition for those jobs and staved off the investments in technology that would make those jobs more productive and thus more valuable.
“You are looking a long, long way out...”
Could be but I have seen how quickly things can change. I was born in 1944 and am already well beyond the average life expectancy forecast for me at birth but I may live to see 2044 yet. I live within fifty miles of my birthplace but it is like living on a different planet now. My own life in some respects may be close to my early life but in other ways is like a science fiction story from that period. Just how long is a long, long way out?