For the general software user.... maybe. Seen advanced users and developers acting like that makes them seem very likely underestimating or ignoring the power of features like history and how you can combine and compose commands.
What is actually left is a tiny group of people compared to all the computer population.
Terminal is a thing of the past. No use pretending it isn't.
Certainly not on HN. You could say the same about assistive technologies, for example.
Also, the current "computer population" still is a distortion. A lot of people started using computers to access the internet and have some entertainment. This is being replaced by smartphones, tablets and smart tv's. So, the advanced users share on "computer population" is (I think) increasing.
You can see some evidence of people using less the "computer" and more other devices: https://gs.statcounter.com/os-market-share#monthly-200901-20...