Computers can replace 70 to 80 percent of the people. You just are not seeing what has happened. Take something like filling out income tax forms. With a computer program, one person can fill out as many income tax forms as eight people used to be able to do. So the computer has replaced about 70 percent of the people that used to do income taxes.
Ditto surveyors. The computer has not replaced all surveyors. But surveyors now use sets of equipment so that they do not have to do all the calculations. The result is fewer surveyors needed.
And then there is the wonderful voice recognition. To order a prescription refill, I never talk to a person. And if I spoke Spanish, I could probably do it in Spanish.
Now an engineer uses a cad program to generate a drawing. That drafting job has been replaced by a computer. The cad drawing is then used to generate a cnc program. And the machinist has been replaced by computers.
Nucor has at least one plant that makes nuts and bolts. It runs 24 hours a day and on the graveyard shift they save on electricity. Why? Because they run lights out with no humans actually working on the graveyard shift.
Take the postal service. The letters and packages are sorted by computer.
So there are jobs that require people, but not as many people as the jobs used to require.
Dan