I am not in love with the idea of pure hydrogen cars due to the inefficiencies involved, but I can see a hydrogen/BEV plug in hybrid being a good option if hydrogen infrastructure gets built out. As is, I drive a Chevy Volt, and while its battery range is low it is enough for the majority of my daily driving. The biggest downside of pure EVs is charging time when you're driving on long trips, and in my Volt I don't have to worry about that as I can just fill up with gas. Well, do the same thing but with hydrogen rather than gasoline and you have a car that can refill quickly like a gas car but can be powered entirely from renewable energy sources like a pure BEV. You need some lithium but less than you would for a full size battery. You still have the capability to charge at home and assuming the battery can do a reliable 50 miles or so you would only need hydrogen for longer trips. You could leave the hydrogen tank empty to avoid leakage and safety issues when you aren't doing a road trip. Also, hydrogen cars are EVs anyways so the drivetrain doesn't need the extra complexity of a conventional hybrid, just switch power between the battery and hydrogeb fuel cell.