I think the technology is already here for H2 fuel but not being released. NASA already has H2 engines/generators for Space. It would be a real game changer to have an almost infinite resource from H2O to get the H2.So what happens when hydrogen fuel becomes safe, effective and available? No more batteries with hydrogen when it's fully developed without need for battery backup. IMO, that technology is on immediate horizon. Plus it's the next home power system.
If you look at the weapons that are made, we went from Atomic Bomb, Nuclear, and Hydrogen the most powerful that countries won't even make hydrogen Bombs anymore.
H2 is where future is for energy.