It's a good bet that vehicle form factors will proliferate. We are at the point of having the first purpose-built vehicles. When there are millions of them they

It's a good bet that vehicle form factors will proliferate. We are at the point of having the first purpose-built vehicles. When there are millions of them they will probably vary in size and capacity. But only if smaller ones can be cheaper and usage patterns support high capacity vehicles, which probably won't be uniformly true across different cities.