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Sounds about right, I'm no expert. The idea of passively generating zero-carbon fuel is very appealing to me but the reality is no doubt less simplistic. For cars and home heating I guess we'll be almost totally battery powered/electric before hydrogen as a fuel becomes economically viable. It might have a place in rocketry though.
frankenbike
Hydrogen is a poor fuel as it has a low specific energy.
It also takes a lot of energy to compress it to a liquid,
and special alloy tanks to contain it.
There is something to be said for injecting (upto 6%) hydrogen
from electrolysis from 'surplus' wind power into the gas pipeline system.