> The moment it's an order of magnitude less, then self driving car will become default.
This is rational but I don't think it's true. ~37,000 people die from car crashes every year in the US, from about ~35,000 accidents. Each individual Tesla crash that results in any serious injury or death is still a national news story. Humans are bad at estimating probability; it's hard to imagine popular support for self-driving cars if they kill thousands of people each year. Even if the alternative is tens of thousands of deaths, we have already collectively priced that in as a risk of living in a developed, automobile-driven society, such that fatal crashes never rise beyond local news.