This is a good point and does not get that much attention. Electric cars are still large machines with a large environmental input. It is more environmentally friendly to just build out transit and encourage density. The vast majority of people would not need personal cars were they to live in a walkable area with good transit. Not only that, road building and maintenance is a far greater money sink than transit. People are just used to it and don't think about it.
There will always be a need for some people to have personal cars. There's no silver bullet to climate change, and moving to electric is a good thing. However, we realistically need to reduce total consumption (in terms of environmental resource input) massively. Making it easier for people to live without cars is relatively low-hanging fruit, and increases quality of life, to boot.
You could argue it's a good thing they're more expensive while the alternatives are phased out, more people would need to use public transit or live within walking distance of places they use cars to reach today.
