It won’t happen at all, because you can’t seem to make any arguments beside “It’s cleaner” and “You’re a BEV fanatic”. If that’s seriously the arguments for hydrogen, it’s doomed.
The truth is that you’re arguing that a theoretical technology is going to win out over the one with tens of billions of dollars of current invetment and millions of vehicles already operating. All this while providing no actual benefit to the end consumer over BEV.