First of all, one needs to see how much weight a hydrogen based solution could save at all. With a fuel cell vehicle, you still need a battery to power the car (the fuel cell cannot handle the peak powers, it can only recharge the battery at a constat rate), you need a high pressure container for the hydrogen and of course the fuel cell itself. So this does not leave much weight advantage vs. a pure battery vehicle.

And just a couple of days ago Elon Musk announced that Tesla would introduce battery powered Trucks and Semis even. Seems he thinks that the weight is not a big problem.