Despite that suburban families are perhaps the least likely Uber demographic, it actually can work well and will likely continue to get better. First, kids in their teens to early 20s might not even have a car. Seniors might not be able to or want to drive. Parents might want to be driven to parties or nights out. Two driver family might be able to avoid that 3rd vehicle. And on and on.

It's not really that helpful to wonder about the worst scenario, especially without any imagination whatsoever.