I wouldn't be surprised if there were. There are plenty of up-and-coming cities with relatively low car ownership (and lots of growth) today. An autonomous-zip-car-ish offering wouldn't have to displace existing motorists to become dominant in such cities. It would just have to outgrow individual-ownership, which would seem more likely than not. Particularly as it subsumes the entire cab and rental industry.
It's just a question of "at what point do the consumer-facing products actually exist?" over that 25-year scale.
