I’m not sure if your statements are actually correct. What you are implying is that there are fewer tailors today than in the past. And I’m not sure if that holds. I’m not even sure that their relative position on the income ladder has deteriorated.
In the time before automated T-shirt production, almost nobody bought clothes. They were just far too expensive. There were of course people that did. And those paid extremely well. But those kinds of tailors still exist!
At the same time, I do think that the comparison is less than apt. And a better one would be comparing it to the fate of lectors and copywriters. A significant amount of those have been superseded by spellchecking tools or will be by AI “reformulations”.
Yet even here I’m not sure if those jobs have seen a significant decline in absolute numbers. Even while their relative frequency kind if obviously tends to 0