Tesla also announced the semi truck "Megacharger." 400 mile range (at less than 2kWh/mile) in 30 minutes. That's about 1.5MW. One and a half Megawatts. Made feasible by using a Tesla stationary battery to buffer the load to the grid and/or solar panels. And a flat 7 cents per kilowatt-hour.
At least for the roadster, it doesnt seem to matter that much. The people who will buy this will do it for the flashy logo and the ridiculous (And dangerous) speed of course.
But nobody speaks about the EV infrastructure.