As there was talk from time to time about the market being tapped out for model S buyers, if that were the case, or even if they just wanted to get higher volumes before the model E time frame, there's another knob they could turn: Come out with a low-end model S that would get close to that $50k price point (post subsidy) where they would take another fat layer off the market pyramid. Maybe 45kwh, supercharging is an add-on, some other features disabled, but could be turned on for $$, or make more money on accessories and upgrades. Get people into the brand, then turn them upside down and shake them.