I think there's a lot of people who haven't thought about it. And I'd like for them to think about it. I don't know what I really expect in an echo chamber like steemit, though.
The fun part is linking to a post like this later on. :D
But yeah, the rationale of 100% accessible architecture is usually, "What if you or one of your family members becomes differently abled? What are you going to do then??"
Ah yes, but you are more optimistic than I am. I tend to believe most of them have thought about it or have started to think about it on some level, but quickly stop rather than have to deal with the messiness of a fully conscious choice to ignore troublesome ideas.