Self-driving cars could give people who live outside big cities and are unable to drive more mobility, but the technology must still overcome some hurdles
Most proper public transit rollouts also include point-to-point vans specifically made to haul disabled people around. Even the USA has these in some places!
They do indeed. My area has them. However, those buses require riders to book a ride a day in advance, which is far from ideal. But even if that wasn't the case, you'd have to wait for the bus to arrive, then you have an unknown transit time (depending on who else is being picked up and dropped off) to your destination.
There doesn't seem to be a good option for disabled people's mobility.
All we have to do is invest more to make it more convenient. Solutions like private autonomous cars are going to help people who are both wealthy and disabled. In the US that's a rarity.