Irrelevant. The purpose of hydrogen-burning engines (or whichever other technology ultimately replaces gasoline) is as a portable storage mechanism for energy obtained from some other source. You can't very well put a nuclear reactor under the hood of your car, but you can certainly use nuclear power to generate hydrogen (or whatever).
Yes, it requires pushing the high priests of peasant superstition out of the way, but that needs to be done anyway.
Yeah, great point. The nice thing about oil is that it comes out of the ground already chock-full-of energy. Looking at hydrogen to solve our energy needs is still silly.
Hydrogen or batteries or whatever, it won't replace oil, coal and natural gas. Nuclear might. Why don't we hear people talking about a nuclear economy and electric cars? Because your superstitious peasants think hydrogen grows on trees.