From what I have been lead to believe by accurate MSM sources (whatever that is worth) they are the wave of the future.
I disagree with its conclusion, because I don't think the government should be investing in the energy market at all. But on the issue directly posed, fuel cell tech proposals are almost always hydrogen-based. Hydrogen has to come from somewhere. And hydrogen is a middling solution.
If we really want to solve problems with the energy situation, we'll probably be better served investing in solar or other natural energy sources. If we want to be BEST served, of course, we'll stay the hell out of it and let the market decide. It did with gasoline--which is the best energy source of its kind, even if it isn't renewable. Alcohol-fueled, pure-electric, Stanley Steamers, and compressed-air vehicles are not a presence in the market because the market could tell which cars had the power source that worked best, and that fuel was accepted by the masses (with some occasional, unfortunate interventions by the gummint). The market will be the best judge of whatever the next energy source is, too, if we just keep government from mucking it up with subsidies and tax breaks.
I wouldn't gamble on anything but the current big energy companies, though. : (