Decouple the drivetrain from the cabin. The drivetrain is automated, and has standard connection types for the personal cabin. So you can have a mobile space that is "yours". Still has all the benefits listed in the article, and handles a few of the problems that "community car sharing" would create.
If a bunch of people are all going the same direction you can pack them into a 10 cabin bus, or a 100 cabin train. When their paths diverge you can have single cabin drivesets routed in advance to the destination. Tailor the drivesets for their intended use/range; short range electrics for small commutes, long range diesels, catenary powered on high traffic areas, perhaps a large multicabin driveset with wings?
If a bunch of people are all going the same direction you can pack them into a 10 cabin bus, or a 100 cabin train. When their paths diverge you can have single cabin drivesets routed in advance to the destination. Tailor the drivesets for their intended use/range; short range electrics for small commutes, long range diesels, catenary powered on high traffic areas, perhaps a large multicabin driveset with wings?