This is totally my fear of what might happen to me. Not specifically the ailment that the author has, but I am worried what will happen to me if/when I no longer can type, in my case possibly due to rheumatism.
My mother has severely swollen finger joints due to rheumatism, my grandmother on my father's side (Farmor in Norwegian, so much easier to explain) also suffered with it, and my older sister is now complaining of painful fingers. My paranoid hypochondriac traits are certain I am genetically guaranteed to suffer from rheumatic fingers.
I depend on typing fast not just for my job but also my hobby and how I perform a lot of tasks in real life. (As I expect it is for many on HN).
Not being able to type much in the future seemed terrible. However, this article and comments have made me realise I might be able to work around it. But still daunting. (If it ever becomes an actual problem).
I already suffer from some RSI tinges due to my mouse which has led me to now own a plethora of different Kensington and Elecom trackerballs and a penguin mouse. And I own two MS Sculpt ergonomic keyboards and plan to buy a Keyboard.io split keyboard soon, to prevent typing RSI.
Guess I can further buy myself out of tomorrow's typing problems with some eye-trackers, microphones, foot paddles, VR goggles etc.