I tend to believe that the number of people working with machine instructions might have even increased! We have much more of the tech that I mentioned nowadays compared to 90s. Also a lot of other industries have entered digital age and in many of them, i.e aviation, transportation, financial, etc. knowing the intricacies of your hardware is crucial.

The thing is that web development has seen such a boom which has seemingly dwarfed everything else in its wake.