Slate says: Self-Driving Cars Will Make Organ Shortages Even Worse. This will happen in two ways.
One, about 20% of US organ donations come from car accident victims. Presumably self-driving cars will reduce the number of organs available.
Two, a common place to opt-in to organ donation is at the DMV, while obtaining or renewing a driver’s license. Presumably self-driving cars will reduce the number of people who get driver’s licenses, and thus reduce the number of people who opt-in to organ donation.
The rest of the article is mostly about ways to improve the organ donation system in the US, irrespective of self-driving cars.
But it is an interesting case study a second-order effect autonomous vehicles will have on our world.