No pricing scheme or any manner of arm-waving will ever make such a gadget economical for general electricity production. The basic factor is still system price. If there were real progress, our utilities would be buying these concentrators. They aren't even buying enough of the product to test it adequately and groups like Entech are really not making it. Entech's failure or poor performance is unfortunate, but one failure doesn't forecast an industry.
People developing both concentrators and thin-film are about to perform miracles in the marketplace.
Mind you, the attractive ROE for concentrators will not apply to cloudy environments. In such places, thin-film will likely be the best alternative. Without storage, renewables aren't even part of the world energy equation. The storage options are really limited today. The nuclear industry is abiding in many fictions.