&gt; there&#x27;s no way enough of the fleet would have changed over in as short a time as ten years to make such a ban practical.<p>Cars sit idle 95% of the time. That means you only need to flip 5-10% of the total fleet. Tesla could do it by themselves building 2-4 million cars&#x2F;year, with the amount of cars needed per year declining the higher the utilization level you can achieve.