I still haven't figured out why cable car systems aren't more commonly used for mass transit systems. They have a small footprint, mostly don't have rights-of-way problems, have low operating costs, and are pretty cheap to build. Some people have suggested high maintenance costs to me, but I don't know if that's true.
I haven't been to La Paz, but I have been to Puno. Get your doctor to prescribe Diamox if you go, that altitude is a killer.
