The point here is that no special accommodation is required!!! The subject's chair fits anywhere a second passenger or a large suitcase would go. These two drivers didn't even want to try, and the second driver harassed her all the way to the airport, even after she put her chair in the car herself.

The special request feature wouldn't be hard to implement, but I'm not sure that it benefits drivers to respond to it unless there was also a system to incentivize them.

Such as being paid for accepting the business?

I'm sure I'm not the only person seeing ads from Uber to use my own car for extra income. For the record, I haven't signed up.

My own car is not wheelchair accessible. It is spacious, and could fit a collapsed wheelchair. But I don't have a lift. Even if I were to sign up as an Uber driver, I can't say that I'm a kind enough soul to add a wheelchair lift or other equipment to make my car wheelchair accessible.

I might be willing to do so for the right incentive. If Uber were to get me a discount on the modification, or promise to buy my car from me when I no longer want it, or give me a higher percentage of the fare when I pick somebody up, etc. But I, personally, wouldn't foot the bill for purely altruistic reasons.

That seems like to right answer to me.