I'll take the risk of ridicule from the future and say it will never make a significant impact on the automotive world without some kind of miraculous revolutionary breakthrough that we can't even concieve of now.

There are far to many problems and limitations to Hydrogen powered automobiles compared to flex fuel and plug in hybrids to make it a truly competitive technology. Given that it takes about 20 years before any change trickles through the system to make a real impact, by the time Hydrogen technology is "ready" for major automotive use, if ever, battery and other alternative fuels will have surpassed it in ease of use and cost in perpetuity, just as it's by far, the most inefficient solution today.

Personally, Hydrogen cars belong in the same category as the Nuclear and Turbine cars, as evolutionary dead ends.

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