I've heard Tesla say that they will not need a large number of superchargers because most people will charge up at home. This is partially true. As Tesla's become more common, eventually there will be increasing numbers of used Tesla's for sale. Since electric vehicles should last longer there will be a lot of used vehicles for sale. People that buy these lower cost used cars are going to be less likely to be able to afford an at home charger and more likely to live in an apartment or be renting where they won't install their own charger. They will be exclusively using supercharging stations. This will greatly increase the need for the number of superstations. Some type of low cost loan program for installation of home chargers may help. Some way of spreading out the cost. It is still many years out but is something Tesla should start thinking about now.