That is why I said Hydrogen fuel cell “like”. Technology changes and we advance in a geometric fashion with esch advance fostering greater and more rapid advances that follow. Probably what the ultimate solution will be, if in fact there ever is an “ultimate” solution (as opposed to an ever evolving one) it will be something unheard of today. Or perhaps it will be the finding of the key to use cold fusion as a power source. This would give us the great power of the sun and seemingly would solve our energy problems forever.
It will always take more energy to extract hydrogen from water than the useful energy we will get out of the hydrogen.