More than that, we all become disabled. It's just a matter of time. And some are more aware of that than others, based on the comments I see in this thread :-)
The lead of UX at my company likes to say that everyone becomes disabled temporarily once in a while. You ever want to watch a video in public but forgot your headphones? Ever lose your glasses and have to go a few days before your replacements come in? Ever try to open a door while also pulling a cart with heavy items?
Accessible design ends up helping anyone who isn't at optimal ability at that very moment.
