If in the next five years electric battery vehicles become a very big pain, then I suspect you will hear about fuel cell cars ... or whatever the perceived pragmatic replacement is.

That we don't hear about hydrogen fuel cell vehicles actually suggests to me that they are not a viable option.

I presume, stupidly perhaps, that there are bigger thinkers than me (or certainly people in positions that have a lot more to lose or gain in this field) that have already counted the beans and still see the electric (battery) vehicles as the current future path of least resistance.

At the very least, swapping batteries for fuel cells seems to be a fundamentally simpler step than swapping ICE for electric. Going to electric cars generally, regardless of the source of power is a big move for the auto industry.