If disability now means needing help, and help is something that everybody needs sometime, then disability really refers to everybody at some time.
And inasmuch as everybody should have the help they need, and statute already says that disabled people can get help, it works out well in practice. Everybody can claim that they’re disabled when they’re disabled and get the help they need. Sounds great!
But disabled used to mean something much more narrow and uncommon, and there’s still going to be need to find new language for that.
I think a blanket term for disability isn't useful and it's much more productive to focus on forms of impairment - there's no real similarity in treatment and support between a person who was hit by a car and needs a wheelchair and someone otherwise normal looking who is prone to sudden violent outbursts due to a neurological disorder. And, unfortunately, one of those people is much more likely to be looked on with sympathy and the other shamed and feared - but both of them can live normal lives with proper care.
We’re getting close, but it’s okay. Expansion of the term has helped people and we’ll eventually come up with new common language to distinguish more and less catastrophic forms of disability.