E commerce is still 10-12% of the global retail sales. For many developing countries, it is just starting. How our last mile delivery will change when E-commerce reaches 50% of retail transactions. It requires a highly automated infrastructure in larger cities coordinating between robots and human though sensors and internet connectivity. Check out this article from MIT talking about the last mile infrastructure for the future
http://news.mit.edu/2018/mit-e-commerce-spurs-innovations-last-mile-logistics-0904