Sure, this sounds like a good idea until you take into consideration how much energy it took to produce that matrix of peizoelectric generators. And I seriously doubt that 60% of the clubs energy can be generated by dancing. Why not just mount a matrix of these under our nations highways? We could drive away global warming!
The inventors have the spirit, I give them that, but we need to pound into everyones head the idea of embodied energy (emergy), or how much energy it took to produce any given object. Bundle that with an energy budget and you get a much broader view of where the energy is coming from and where it is going. Hey, I just described permaculture.