Maybe the extinction is the population of users that's entirely unused to graphical user interfaces. You don't need to take that group into consideration anymor

Maybe the extinction is the population of users that's entirely unused to graphical user interfaces. You don't need to take that group into consideration anymore, so, goodbye to usability experts. I think that's selling usability experts short. Good UI design isn't just for computer novices. It's also for power users. An extremely well-designed user interface can dramatically enhance productivity and allow a power user to get into highly efficient and satisfying workflows. Conversely, a poor user interface (such as all the modern ones we have today) can be extremely frustrating and unproductive to use, to the point where power users give up on trying to complete their tasks efficiently. You are definitely correct about computer illiterate people. I have several older relatives who are in the same boat as your father was. My father is 73 and he's a capable user of his phone, though he still needs a fair amount of tech support from me.