Yeah economies of scale are absolutely a thing, but what the average person is coming around to is the idea that the personal vehicle is environmentally unfeasible. Tyre wear alone has a significant environmental impact and electric vehicles are only going to make that problem work. That's just one factor of countless factors. Transportation is a necessity, personal transportation isn't (not entirely true, some places have such terrible transportation infrastructure that a personal vehicle is a necessity). Electric car manufacturers are never going to tell you not to buy their car regardless of the fact that their products significantly contribute to climate change.