I think Hydrogen fuel cell tech doesn't belong in passenger vehicles; there batteries can do a fine enough job. I believe the future of H2 is in intermodal transport, that is, trucking and (previously diesel) trains.

Why?

Do the math on weight, and you'll quickly see that you can't fit enough batteries in a Semi to give them the range that they need for long haul, while still being able to carry any appreciable amount of goods (There's a 40T limit on the roads in Europe, YMMV).

Together with Green Kerosine for Airplanes, and you've got Carbon-neutral transport: Electric Cars, Hydrogen Trucks and Trains, and (Green) Kerosine Airplanes.