Innovation is something that is either capitalized on by the developer, or taken to new heights by others at a later time. Later would be, well....now. It's been 50 years. There is nothing inherently virtuous about being "unique" in concept...there are many unique failures. I have unique plans for a square wheel and a ten-sided stop sign (plus I plan to charge about double existing prices), but they don't seem to be going anywhere. Dardick's design was an abject failure for numerous reasons and demand was zero. That = failure. If you have a personal admiration for Dardick's designs, that's on you. I don't see the visionary figure there.
Back in the second grade, I developed a design for a series of vehicles which ran on compressed air. As they rolled down the road being powered by compressed air, there was a crank on the axle which pumped the tanks full again. Algore would have loved it. It was as green as you could get.