How fast will we see electric vehicles a mainstay in the US?

"It's not a question of if they are coming, but how fast will they be here. One is the speed at which there is infrastructure built for them. There are still not a lot of places to charge a car. We need more charging stations. Eventually EV's will be predominant. Another is how fast the federal government moves on emissions requirements that will cause you to phase out fossil fuel vehicles. That’s a political question. It could be a little longer than people are saying – the infrastructure of gas stations has to continue because a lot of people like me keep their cars for years."