While that seem ostensibly sensible it isn’t really useful, you can’t transition away from just large cars, you still won’t have the carless infrastructure in place anyway.
As to vegan, i find the entire thing worrisome, conflating say a poor Cambodian who eats a little chicken with his noddles with a vegan American is ridiculous. The americans refrigerator alone is more destructive then his chicken, veg and noodle dinner. The entire idea is to look holistically. If yoire a vegan with a large dog, for example, you’re going to eat more meat then I do with my little permeculture set up and the poultry I raise and eat.