I'd be interested in a hydrogen fuel cell car that operates more like a plug-in hybrid. The HEV's already operate like that, but I'm saying one that can run on battery alone for hundreds of miles before needing hydrogen.
With my home solar I can charge the battery. There are times I'd like to use the BEV through charging deserts. A hydrogen fuel cell would add more miles but add little weight (the weight of hydrogen gas tank) compared to adding a lot more battery. But producing my own hydrogen with an electrolyzer would be inefficient for regular use, so I'd prefer to use the hydrogen only on trips with charging deserts. So I'd prefer to build up hydrogen gas with my home solar only on days I have so much solar that my home is powered plus my home batteries are fully charged plus my EV's battery is charged and I have nowhere else useful for the excess solar power to go (run an electrolyzer to build up hydrogen for the next road trip).