For this to make any sense, you have to believe that fuel cell cars will be viable and economic before electric or plug in hybrids. And that an economic way to generate and transport hydrogen will be developed. I'd rather put my money on battery technology.

"Sustainably produced hydrogen" is a real hoot. Not only is this unlikely, there isn't even a concept out there other than from sustainably produced electricity - which could be more efficiently transported and directly used in a battery powered car.