20 years as in real replacement, maybe. But change will be cca gradual if looking at whole market, even if composed of many smaller jumps. Top management of companies are now itching for that promised paradise of minimal IT with just few experts. Then comes inevitable sobering up, but the direction is clear.

I wouldn't be considering programming if choosing university studies now. With that smart, many other fields look more stable, albeit demand curve and how comfy later years of career looks like is very different (maybe lawyers, doctors, for blue collars some trades but look at long term health effects with ie back or knee issues).