We'll ride a lot more public transit and bicycles when cars of all types pay their true costs.
Another dirty little secret about Tesla and Musk: they aren't helping the environment. Helping the environment means fewer cars and of those we can't get rid of, make them electric. Their strategy is more cars. That is, the tactic of electric is useful within a strategy of de-growth, but they have a strategy of growth. In fairness, they are a car company. A meaningful strategy to shrink the market would require changing the playing field, which would likely have to come from outside the field -- government or leadership at the level of Mandela or Dr. King.