>If this were to remain, the large majority of the drivers will not have a position to fill. It will not be viable.
That's correct, it's probably not viable.
>How are they not equipped?
Most personal car insurance policies don't cover operating your car commercially. In addition, each driver would be required to conform to ADA rules (which apparently not all of them were doing https://arstechnica.com/tech-policy/2015/04/blind-users-with...) and the penalties for noncompliance are higher than most people can afford. And those aren't the only rules they would be responsible for - the risks are just really high!