Seems like the system in La Paz is generating something like 70,000 daily riders, which is quite impressive. If we had an equivalently used system charging the standard $3 fare, with the very minimum maintenance/labour costs of gondolas, we would be making $210,000 of daily revenue.
But, the hourly capacity (using La Paz' numbers, 10-seat cars every 10 seconds) is restricted to 3,600 which would be inadequate for the waterfront unless we build multiple lines on the same corridor.
Also, I worry about accessibility, and I do not mean physical. A lot of people suffer from a fear of heights (myself included) and vertigo, etc. Taking a gondola might not be something they want to do to replace their commute.