Electric cars won’t “make a dent” in carbon emissions until most of our electricity comes from renewables and nuclear. At least in the USA, we are many years away from this. BEV uptake is unfortunately not the rate-limiting step.
And even if we had 100% renewables tomorrow, cars would still be incredibly inefficient (2 ton car for most times only 80 kg load (aka one human)), loud, dangerous for everyone not in a car, expensive for owner and state, etc…
Good thing these batteries will show up in all kinds of vehicle once the tech is proven, then. Smaller urban runabouts, ebikes, scooters, etc.