Zeev, I absolutely agree with your take on fuel cells not resolving the source of energy problem. My understanding, however is that there is a net savings in available/usable energy post-conversion from gasoline or ethanol to hydrogen. In the case of gasoline, the gov't claims 100% increase in energy benefit (http://www.fueleconomy.gov/feg/fcv_benefits.shtml). disclaimer: I claim no expertise whatever in the chemistry of this stuff.
And, of course, I have no idea how to measure the potential re-tooling of the delivery structure. For one thing, this appears to be an area where the technology is not at all resolved. Perhaps we are more likely to see on-vehicle conversion and the same old filling stations? At any rate, this will all be decided by corporations for which successive short-term bottom line results will continue to be the greater determining factor, no?