Yup
Stabbi
We die.
When I was in engineering school, I was lucky enough to have a based professor. He would start lessons by describing a tragedy. A paraplegic burns to death in a stairwell, another cracks their skull after being pushed down the stairs. He would then show us solutions to these issues from long before the tragedy. Slides to carry you down, bags you sit in and use the rails as a slide. Fire safe rooms that you could shelter in and can be accessed from the outside.
This also does not simply affect us disabled fucks. Say there is an earthquake, and you shatter a leg, or worse, your hip. You are now in the same stairwell as the rest of us.
Also, god help you if you're overweight. When my legs stopped working, I gained 200lbs. I knew then and know now that if I am in a burning building, I will be the last one out, if I get out.
Which especially sucks as 250 for anyone over 6' is barely above average. At my peak, I was 320