Well given it provides a service for a majority of people, it is viable. But if you hold it to the same accessibility laws of other businesses, it won’t work without alterations.
A co-worker does Uber and if the person is able to get them selves in and out of the chair and he can put it in the trunk, no problem. That is how most people carting around their parents in their Buick do it. People needing more than that Uber would need a special fleet, just like I assume Taxi services do. I mean, most Taxis are sedans, and some vans, but even most of them don’t have powered lifts. I assume they have SOME vehicles like that, but I bet one has to wait for them as well.
I’ll find out in 20 years my leg completely withers away and my other leg is too old to compensate. Unless I get powered robot legs. Fingers crossed.