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The one big disadvantage of fuel-cell cars is that, to be widely accepted, you'd need a nation-wide infrastructure for producing, storing, and distributing hydrogen. This has been estimated in cost at $300 billion. To be fair, the gasoline production/distribution infrastructure would cost just as much if not more to replace, but it's been built up gradually over 100 years.
A practical battery car, if developed, would not need anything like that kind of infrastructure: just charging stations, and of course everyone's home can be a charging station fairly cheaply.
I don't say we're going to get there, necesarily. But the guys developing this car have already accomplished things with electric cars that the big automakers said couldn't be done. So I want to keep an open mind.
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