Automated cars might fix things a little, but congestion is mainly a function of the number of vehicles. Plus, cars, no matter how automated, move very few people per square foot compared to the capacities of a bus or subway. Buses and other mass transit are not going anywhere, and you'll likely see an expansion of these services over the next decades. If transit is rapid enough, regularly provides service, is reliable, and has stops close enough to people's destinations, many people would use it. But when it becomes unreliable and takes forever, people abandon it in favor of personalized services like Lyft, which compounds the congestion problem and worsens existing surface mass transit.