If I may play devil's advocate for a moment....
The thing about hydrogen as a mainstream fuel is the insane ease in making it yourself. Plain water with the right ions, easily obtainable, a bit of electricity and you have recoverable hydrogen and oxygen. The more inventive people will be able to produce, capture and use the hydrogen. Less inventive will create hydrogen, but not do anything with it. The inept will blow themselves to kingdom come, and totally legal, free and easy. It's easy to see a gasoline leak, it puddles and form wet spots, and can be smelled. Without expensive safeguards, hydrogen leaks are not easily detectable.
And then there is the government and big business. If people successfully make and use hydrogen at home for personal use, what happens to the fuel industry? Would it be significant enough for regulations prohibiting home manufacture and use under the guise of safety?
And I speak partially from experience. In my younger and more experimental days, I did make hydrogen and oxygen at home. A dilute solution of battery acid, a couple of wires, a glass Coke bottle and a battery charger. Insert the wires into the bottle which is upside down in a container of the liquid and connect the charger. In no time at all, you have a bottle of hydrogen and oxygen. Don protective gear (motorcycle helmet with plastic face shield and oven mitts). Light a candle, uncork the bottle and put the open neck to the flame. Makes the biggest bang. Thank you, Mr. Pitts, my 9th grade science teacher.