[Tex17]

I just can't see that gondola system being efficient enough. They'd be a combination of a) too slow, b) too small (too few people in each car) to really be any good as a public transit system. Maybe just as a connector from downtown to Zilker/Barton Springs, sure.
Plus, there will be breakdowns. You can count on that with any mechanical device. You can get off a train, bus, etc. You're stuck up there on a gondola.
Again, it seems cool, but I just can't see it working well enough.