I honestly can't see any kind of redevelopment at the power plant being very successful without something like a gondola. There isn't a lot of space for parking on site and there shouldn't be any plans to allow for public parking at this location, if they want it to be successful. The area doesn't need a parkade and having a novel way to get to whatever the power plant becomes would add to the experience of getting there. Taking the bus just doesn't have the same excitement.
If the gondola were to go bust for some reason, and I don't think it would, if the power plant is to become a destination, then either ETS could take it over and run it or the City could sell it. These are modular systems that are scalable and can be moved/sold from one ski resort to another. After the Whistler Olympics, a chairlift was moved from Whister to Sunshine Village in Banff. Sunshine Village sold their 35 year old Angle Chair to Castle Resort in southern Alberta. Lake Louise gondola came from Palisades Tahoe in California, and lastly, the Polar Peak chair at Fernie was previously installed at Nakiska. These things hold their value, even when they are decades old. I know some people brought up the concrete foundations as a remediation issue, but maybe the City could have interpretive art installations around each tower or something to turn it into its own destination, which could then be incorporated into the concrete so that it could just be left in the ground in the event of a removal. I', not saying this is the best solution, but there are ways around this.
I don't think the City should be on the hook for rescue services, in the event of a failure. Ski resorts have trained staff for emergency evacuations and do not rely on the local fire department. Whistler has the Peak to Peak gondola, which is over 400m above the ground and a rescue on that would be far more complicated than anything in Edmonton.