It still works on people, so probably never.

Unless there’s a real term for this, “functional math illiteracy” is a thing. If people can get by with reading a 5th-grade level, they absolutely can get by with calculating at a 2nd or 3rd-grade level. Rounding, fractions, multiplication, are probably out of reach for more people than you think.

I once new someone with dyscalculia, which is way worse than all that, and they worked behind a cash register for a living.