The stumbling block seems to be how to produce hydrogen economically.
Quote:
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“More energy is needed to isolate hydrogen from natural compounds than can ever be recovered from its use,”
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From:-
http://phys.org/news85074285.html
To a certain extent I feel the same about vehicles that rely on electricity from the mains which has to be stored in batteries before being used to power the wheels.
Unless you have a source of 'green' electricity (such as hydro) I don't believe that the sums add up.
We need to know 'whole life' costs (likewise for nuclear power) before we commit.
I can, however, see the benefit of hybrid power for city use to reduce pollution.