Cars are responsible for some 15% of carbon emissions globally. Even if we could replace all cars globally (a very long shot already), we haven't accounted for the fact that most electricity generated is by burning fossils. China is by far the biggest builder of new nuclear power, but they can't even keep up with their growth, much less overtake it.
Let's say we can get all cars replaced (meaning we fix range, cost, the sophistication required to service, grid capacity etc.), you've maybe shaved 5% off emissions - and that's a one-off, not a continuous improvement, the growth in carbon emissions keeps soldiering on.
It's irrelevant. We have to find ways of generating electricity cleanly anyway. So, we can kill 2 birds with one stone by making cars use that electricity. Better than driving hydrogen bombs around.
IMHO running out of fossil fuels and their escalating price is a much more compelling reason to use electric cars than the emissions argument.
Let's say we can get all cars replaced (meaning we fix range, cost, the sophistication required to service, grid capacity etc.), you've maybe shaved 5% off emissions - and that's a one-off, not a continuous improvement, the growth in carbon emissions keeps soldiering on.