This seems like it does have potential due to the fact that they can tune the vertical and lateral stiffness independently. That means that even though now rolling-resistance may not be an advantage on these, tweel technology might come out at some point that could minimize rolling resisitance without sacrificing as much stability or handling ability as current low-rolling-resistance tires.

The only area I find would be suspect though is with respect to noise. It seems like having metal springs rather than air is going to be much noisier, and I cannot think of an easy solution. A tweel might be hard to market if it has few benefits over a typical run-flat, yet is extremely noisy.