So that batteries become both lighter and cheaper and the advantage grows?
I don't think time favors hydrogen cars. The underlying technology was available over 50 years ago (used on Gemini spacecraft as hydrogen fuel cells in the mid 1960s, and in stationary form in the early 1930s, first developed in the lab in the 1830s). Lithium chemistry has advanced dramatically in the time since it was first invented. There were no rechargeable lithium chemistry batteries 50 years ago, even in the lab. And they didn't enter practical use until the 1990s and significant yearly progress continues today.
Time favors lithium chemistry rechargeable batteries.
We will literally have silicon anodes batteries in 2-3 years, we will have pure lithium anodes in 4-5 years, after that we will have sulfer-lithium batteries within the decade.
With lithium annodes we are at a point where you can replace most air-travel with battery planes.
There is way more upside for improvement in batteries compared to fuel cells.
Fuel cells have no future in transportation unless there is some fundamental breakthrew that nobody can anticipate, nothing I have seen even in research improves fuel cell technology enough to make it viable.
I think for seasonal storage there are better options.
I also don't see how fuel cells beat ICE even a renewable produced carbon fuel like methanol or Dimethyl ether. I would prefer small nuclear reactors but I seem to be the only one.
I don't think time favors hydrogen cars. The underlying technology was available over 50 years ago (used on Gemini spacecraft as hydrogen fuel cells in the mid 1960s, and in stationary form in the early 1930s, first developed in the lab in the 1830s). Lithium chemistry has advanced dramatically in the time since it was first invented. There were no rechargeable lithium chemistry batteries 50 years ago, even in the lab. And they didn't enter practical use until the 1990s and significant yearly progress continues today.
Time favors lithium chemistry rechargeable batteries.