Yes it's a complex device, but so is a bus, and they're not wear near as efficient. I think we could probably maintain them if we wanted to.

Think about it, it's superior to every other last mile transport method. It's continuous, so it's right there when you need it, with no scheduling required, it doesn't take up any more space on the sidewalk it replaced while having the exact same function as a sidewalk, it cuts down on journey times and encourages walking.

It even accommodates boring American city grids.