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I've seen a horse on a treadmill. It still puts out 1HP.
On a bicycle, coasting is a welcome break from time to time, but only if it does not cost any progress. On choppy terrain, it gets tedious. In a velomobile, which coasts extremely well due to streamlining and weight, city riding is often a series of short, hard anaerobic sprints, followed by long rests with no motion in the legs - most unpleasant. A streamliner really needs an electric system to smooth out the effort.
Elevated bikeways are a far better investment than "expressways" for cars in cities, but I don't think many people will pay to use the Schweeb. It is just not very convenient to use. Let's put a bike lane on top of that rail, and see which gets the traffic.
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