While it might be good that vehicles will be cheaper, I don't think it will be good for traffic. In a lot of countries, traffic has been worsening because there are more cars on the road. In the Philippines, it has even regressed a bit, since people are buying motorcycles instead of cars to avoid the traffic [they split lanes, and squeeze everywhere]. Cars aren't also comparable to cellphones, where people change their phones every year. Even at 5k USD, the cost is too high.