Hydrogen is not particularly dangerous and certainly not as bad as gasoline fumes or natural gas. It's pretty hard to make it hang around long enough to accumulate since it is so much lighter than air. A small vent in the roof would let it go away immediatly.
Once we get over our nuclear phobia it could become a viable fuel but you need energy to spare to make any quantity of hydrogen at a reasonable price. In a nuke plant they might even come up with a thermal cell, sort of a fuel cell running backward that outputs hydrogen.
Then we would be down to designing the transportation and distribution chain. The other big problem with hydrogen is the molecule size. A submicroscopic pore that would hold back a methane molecule is an open door to hydrogen. That is why your helium balloon seldom lasts the night (pores in a latex balloon) and helium is twice the size of hydrogen.
