Maybe I'm overly optimistic (or pessimistic depending on your point of view, I suppose), but 50% by 2047 seems low to me. That just feels like an eternity of development, and even if we maintain the current pace (let alone see it accelerate as AI contributes more to its own development), it's difficult for me to imagine what humans will still be better able to do than AI in over a decade.
I do wonder if the question is ambiguously phrased and some people interpreted it as pure AI (i.e. just bits) while others answered it with the assumption that you'd also have to have the sort of bipedal robot enabled with AI that would allow it to take on all the manual tasks humans do.
Some interesting work here on using LLMs to improve on open-domain robotics: https://arstechnica.com/information-technology/2023/03/embod...